13 best diodes

Diodes are fundamental semiconductor devices widely used in electronics and electrical engineering. Here's what you need to know about diodes and their connections to semiconductor products and industrial applications:

  1. Semiconductor Nature: Diodes are semiconductor devices made from materials like silicon or germanium. They allow current to flow in one direction only and exhibit a nonlinear current-voltage characteristic.

  2. Rectification: One of the primary functions of diodes is rectification, the process of converting alternating current (AC) to direct current (DC). Diodes allow current to flow in one direction only, enabling the conversion of the changing voltage of AC into a unidirectional flow of current.

  3. Types of Diodes:

    • Rectifier Diodes: Specifically designed for rectification purposes, converting AC to DC.
    • Light Emitting Diodes (LEDs): Emit light when current passes through, widely used in displays and indicators.
    • Zener Diodes: Maintain a constant voltage across their terminals and are used for voltage regulation.
    • Schottky Diodes: Have a lower voltage drop and faster switching speed than standard diodes, suitable for high-frequency applications.
    • Photodiodes: Generate a current when exposed to light, used in light detection applications like solar cells and photodiode arrays.
    • Varactor Diodes: Have a voltage-dependent capacitance and are used in tuning circuits.
  4. Semiconductor Products: Diodes are essential components in various semiconductor products.They are used in integrated circuits, amplifiers, oscillators, and power supply circuits, among others.

  5. Industrial Electrical: Diodes find extensive applications in industrial electrical systems. They are used in rectifiers for converting AC power to DC power, which is crucial for running many industrial machines and equipment.

  6. Industrial Scientific: In scientific instruments and industrial measurement devices, diodes are utilized for signal processing, amplification, and rectification tasks. They are vital in ensuring accurate and reliable measurement data.

  7. Switching and Protection: Diodes are employed as switches in digital logic circuits and for protecting circuits from voltage spikes. Diode-based circuits can prevent damage to sensitive electronic components.

  8. Temperature Dependence: Diode characteristics are temperature-dependent. This property is utilized in temperature sensors and compensation circuits, where the voltage drop across a diode varies predictably with temperature changes.

In summary, diodes are semiconductor devices with diverse applications in rectification, signal processing, and voltage regulation. They play a pivotal role in both electronic and industrial systems, ensuring the efficient and reliable operation of various devices and equipment.

Below you can find our editor's choice of the best diodes on the market
  

BOJACK 14 Value 240 pcs Diode Assortment Kit Contain Rectifier/Fast Recovery/Schottky/Switching Diode 1N4001 1N4004 1N4007 1N5404 1N5406 1N5408 RL207 FR107 FR207 UF4007 1N5817 1N5819 1N5822 1N4148

BOJACK

Based on 355 reviews Check latest price
  • BOJACK Diode assorted kit contain 14 value 240 pcs with different current and voltage.
  • Rectifier Diodes : IN4001 (1A 50V) IN4004 (1A 400V) IN4007 (1A 1000V) IN5404 (3A 400V) IN5406 (3A 600V) IN5408 (3A 1000V) RL207 (2A 1000V),Fast Recovery Diodes : UF4007 (1A 1000V) FR107 (1A 1000V) FR207 (2A 1000V) ,Schottky Diodes : IN5817 (1A 20V) IN5819 (1A 40V) IN5822 (3A 40V), Switching Diode : IN4148 (200mA 100V)
  • The diode assorted product is easy to store ,Use an anti-static bag with a clear mark for packaging,not easy to damage.
  • Lead-Free / RoHS Compliant Electronics Component.
  • This product is widely used in product development, student experiments, maintenance, production, etc.

User questions & answers

Question: Will these work on doorbells
Answer: If you have some sort of DC requirement whether homebrew or not... might work if you design the circuit correct for the required DC input for your DC doorbell device. Thinking a doorbell camera won't need much for current and you can wire in parallel if required too. Not certain why though, please elaborate.

MIC 1N4007 DO-41 Axial Silastic Guard Junction Standard Rectifier Diode (Pack of 20)

MIC

Based on 200 reviews Check latest price

Product description

The 1N4007 are Axial Silastic Guard Junction Standard Rectifier Diodes in a DO-41 package with a Maximum Repetitive Peak Reverse Voltage: 1000 Volts.

User questions & answers

Question: Is this ok for flyback for solenoid
Answer: No
Question: Can be used as surge diode for telephone 24v
Answer: Yes

HUAREW 12 Values 300 Pcs Rectifier Diodes 1N4001 1N4002 1N4004 1N4005 1N4007 1N5404 1N5406 1N5408 Schottky Diodes 1N5817 1N5818 1N5819 Switching Diodes 1N4148 Assortment Kit

HUAREW

Based on 26 reviews Check latest price

Product description

HUAREW High Quality Rectifier/Schottky/Switching Diode Assortment Kit



Packing quantity:



Rectifier Diode:

1N4001---------------1A/50V-------------30 Pcs

1N4002---------------1A/100V-----------30 Pcs

1N4004---------------1A/400V-----------30 Pcs

1N4005---------------1A/600V-----------30 Pcs

1N4007---------------1A/1000V---------30 Pcs



1N5404---------------3A/400V-----------10 Pcs

1N5406---------------3A/600V-----------10 Pcs

1N5408---------------3A/1000V---------10 Pcs



Schottky Diodes:

1N5817---------------1A/20V-------------30 Pcs

1N5818---------------1A/30V-------------30 Pcs

1N5819---------------1A/40V-------------30 Pcs



Switching Diode:

1N4148--------200mA/100V-----------30 Pcs

  • ▲HUAREW High Quality Rectifier/Schottky/Switching Diode Assortment Kit
  • ▲Voltage: 20 V~1000 V
  • ▲Current: 200 mA~3 A
  • ▲Model:Rectifier Diodes-(IN4001,IN4002,IN4004,IN4005,IN4007,1N5404,1N5406,1N5408).Schottky Diodes-(IN5817, IN5818,IN5819).Switching Diodes-(1N4148)
  • ▲Package Quantity: 300 Pcs

BOJACK 10 Values 300 pcs Rectifier Diodes 1N4001 1N4002 1N4003 1N4004 1N4005 1N4006 1N4007 Schottky Diodes 1N5817 1N5818 1N5819 Assortment Kit

BOJACK

Based on 79 reviews Check latest price

Product description

BOJACK 10 Values 300 pcs High Quality Diodes Assortment Kit



Package List:



Rectifier Diode:

30 Pcs * 1N4001 (1A 50V)

30 Pcs * 1N4002 (1A 100V)

30 Pcs * 1N4003 (1A 200V)

30 Pcs * 1N4004 (1A 400V)

30 Pcs * 1N4005 (1A 600V)

30 Pcs * 1N4006 (1A 800V)

30 Pcs * 1N4007 (1A 1000V)



Schottky Diodes:

30 Pcs * 1N5817 (1A 20V)

30 Pcs * 1N5818 (1A 30V)

30 Pcs * 1N5819 (1A 40V)



This diode is Low leakage, forward voltage drop, high efficiency and

low power loss,widely used in product development, student experiments,

maintenance, production, etc.

  • BOJACK 10 values 300 pcs Rectifier Diode Assorted kit with different current and voltage.
  • Rectifier Diodes : IN4001 (1A 50V),IN4002 (1A 100V),IN4003 (1A 200V),IN4004 (1A 400V),IN4005 (1A 600V),IN4006 (1A 800V),IN4007 (1A 1000V).Schottky Diodes : IN5817 (1A 20V), IN5817 (1A 30V),IN5819 (1A 40V) .
  • The diode assorted product is easy to store ,Use an anti-static bag with a clear mark for packaging,not easy to damage.
  • Lead-Free / RoHS Compliant Electronics Component.
  • This product is widely used in product development, student experiments, maintenance, production, etc.

Chanzon Fast Switching/Schottky/Rectifier Diode Assorted Kit (200pcs 14 Values 1N4001 1N4004 1N4007 RL207 1N5404 1N5406 1N5408 UF4007 FR107 FR207 1N5817 1N5819 1N5822 1N4148) Electronic Assortment

CHANZON

Based on 444 reviews Check latest price

Product description

Diode Assortment Kit (14 Part numbers, Total 200 pcs)



Brand: Chanzon





Rectifier Diode



20 * 1N4001 (1A 50V)

20 * 1N4004 (1A 400V)

20 * 1N4007 (1A 1000V)

10 * RL207 (2A 1000V)

10 * 1N5404 (3A 400V)

10 * 1N5406 (3A 600V)

10 * 1N5408 (3A 1000V)



Fast Recovery Diode

10 * UF4007 (1A 1000V)

10 * FR107 (1A 1000V)

10 * FR207 (2A 1000V)



Switching Diodes

30 * 1N4148 (200mA 100V)



Schottky Diodes

10 * 1N5817 (1A 20V)

20 * 1N5819 (1A 40V)

10 * 1N5822 (3A 40V)



Note:

Pack in a ESD Bag with Main Specs Label, for Long Time Protection and Indetification.



  • Lead-Free / RoHS Compliant Electronics Component / Axial Silicon Diodes Set for Arduino DIY Projects
  • Total Pack of 200 Pieces (14 Part Numbers) with different current and Voltage
  • Rectifier Diodes : 1N4001 (1A 50V) x 20 | 1N4004 (1A 400V) x 20 | 1N4007 (1A 1000V) x 20 | RL207 (2A 1000V) x 10 | 1N5404 (3A 400V) x 10 | 1N5406 (3A 600V) x 10 | 1N5408 (3A 1000V) x 10
  • Fast Recovery Diodes : UF4007 (1A 1000V) x 10 | FR107 (1A 1000V) x 10 | FR207 (2A 1000V) x 10
  • Switching Diode : 1N4148 (200mA 100V) x 30 | Schottky Diodes : 1N5817 (1A 20V) x 10 | 1N5819 (1A 40V) x 20 | 1N5822 (3A 40V) x 10

User questions & answers

Question: When it says "20v" does that mean it requires 20v, or that 20v is the maximum
Answer: It means it will support 20 volts when reversed biased, any voltage larger and it will damage the diode as long as your talking about a normal diode. If a zener it needs at least 20 volts to operate normally
Question: Which side is the positive side or “in”. Newbie here
Answer: The way I learned this. "Point to the cat on the ground." In the schematic, the diode has a triangle pointing, which always (read: 99% of the time, except in specialized circuits) POINTs to the CAThode, which is GROUND.

Poilee 15amp Diode Axial Schottky Blocking Diodes for Solar Cells Panel,15SQ045 Schottky Diodes 15A 45V (Pack of 10pcs)

PoiLee

Based on 100 reviews Check latest price

Product description

Maximum Average Forward Current: 15 A MP

Forward Current (at DC10A): 0.55V

Maximum DC Blocking Voltage: 45V



Package Include:

10 x Bypass / Blocking Diode

  • Low leakage and forward voltage drop;Low power loss, high efficiency.
  • Maximum Average Forward Current: 15 A MP.Forward Current (at DC10A): 0.55V.
  • Maximum DC Blocking Voltage: 45V.

User questions & answers

Question: can I use this for 5v solar system; charging 18650 battery and want to block reverse voltage at night time. Would this work to block volt at nigh
Answer: Yes more than enough watt rating
Question: Will these work on 12vdc circuit to block voltage flow in one direction
Answer: As long as you don't exceed the amperage limitation. I use the to prevent back feeding my solar panels.
Question: I'm looking to prevent back flow of current in a low voltage current, in my vehicle (some led lights) want to make sure these will work
Answer: Yes, up to 15 amps. Be conscious of a 0.6V forward drop. Might be a problem for charging circuits, but not for lights.
Question: Once these are installed can I cover them with heat shirk? Plan on crimping to a copper line, is that possible
Answer: sure, that would work. i highly doubt that it would do anything. i would put heat shrink around them
Question: Are these one way diodes
Answer: Zener diodes are two-way diodes. These are one-way.
Question: Are these germanium diodes? Which one should I use for crystal radio
Answer: Crystal radios need the lowest forward voltage possible, because this voltage is subtracted from the already low voltage coming from the antenna. United Nuclear sells these low forward voltage germanium diodes specially selected for crystal radios.
Question: So are these anode- cathode diodes
Answer: A diode has an anode and a cathode. These are the technical terms for the different sides of the diode (the leads or wires that stick out of each side). The anode is the positively charged electrode by which the electrons leave a device, in this case, the diode.
Question: do you know where i can get the rating chart for each diode
Answer: Just Google each diode's number and you will find the rating. Or, look each one up on a site that sells diodes, like Digikey. You can even look them up on Wikipedia, just Google "1N4148 Wiki" and the first search result will be the Wikipedia page for the 1N4148 switching diode, complete with all of the specifications. Or do a Google Image Search for "Diode Chart" and select the chart with the info you are looking for. Everything you want to know about each diode is available on the Internet.

20 Pcs) MCIGICM 10A10 Rectifier Diode, 10A 1000V R-6 Axial Electronic Silicon Diodes

MCIGICM

Based on 153 reviews Check latest price

Product description

MCIGICM 20 Pcs 10A10 Rectifier Diode



Forward Current : 10 A

Maxixum Voltage : 1000 V

Through Hole



Package Include:

20 x 10A10 Rectifier Diode



  • Forward Current : 10 A / Maxixum Repetitive Peak Reverse Voltage : 1000 V
  • Lead-Free / RoHS Compliant Electronics Component / Molded Plastic Case / Plated Axial Leads / Through Hole
  • Low Reverse Leakage / High Forward Surge Current Capability / High Temperature Soldering
  • Pack in a ESD Bag with Main Specs Label, for Long Time Protection and Indetification.

QLOUNI 200pcs 10 Value Rectifier Diode 1N4001~1N5819 Zener Diode Assortment Kit with Label & Clear Box

Based on 71 reviews Check latest price

Product description

QLOUNI 200pcs Rectifier Diode 10 Value Diode Assortment Kit with Label & Clear Box

Low forward voltage drop, high current capability, high reliability and high surge current capability.



Caution:

Before you open the box, make sure it is horizontal displayed and the mark paper is upside. Then open the box gently to avoid mix or scatter.



Description:

Type: Rectifier Diode

Voltage: 10V

Current: 1A

Working Temperature: -55℃~+150℃



Detailed items:

20pcs 1N4001 Rectifier Diodes

20pcs 1N4002 Rectifier Diodes

20pcs 1N4003 Rectifier Diodes

20pcs 1N4004 Rectifier Diodes

20pcs 1N4005 Rectifier Diodes

20pcs 1N4006 Rectifier Diodes

20pcs 1N4007 Rectifier Diodes

20pcs 1N5817 Rectifier Diodes

20pcs 1N5818 Rectifier Diodes

20pcs 1N5819 Rectifier Diodes



Widely usage:

Rectifier diode is a semiconductor device that converts alternating current into direct current.

Perfect use for home, office, industry electrical equipment and electrical appliances.



  • ✦[High Quality] QLOUNI diode provides low forward voltage drop, high current capability, high reliability and high surge current capability, Voltage: 10V, Current: 1A
  • ✦[Multi Range] 10 values each 20pcs including standard diod: 1n4001 diode 1n4002 diode 1n4003 diode 1n4004 diode 1n4005 diod 1n4006 diode 1n4007 diode and schottky diodes 5817 5818 5819
  • ✦[with Label] Each rectifier diode comes with label marked resistance for you to confirm value easily.
  • ✦[Packed with Box] 200 PCS all come in a handy box with different molded area. Box will not break easily, parts inside will not slide or move around.
  • ✦[Various Usage] Suitable for many electronic projects hobbies and repairs, used in radios powers supplies and other devices.[Various Usage] Suitable for many electronic projects hobbies and repairs, used in radios powers supplies and other devices.

Chanzon 1W Zener Diode Assorted Kit (30 Values x 10pc 3V 3.3V 3.6V 3.9V 4.3V 4.7V 5.1V 5.6V 6.2V 6.8V 7.5V 8.2V 9.1V 10V 11V 12V 13V 15V 16V 18V 20V 22V 24V 27V 30V 33V 36V 39V 43V 47V) Assortment Set

CHANZON

Based on 355 reviews Check latest price

Product description

1W Zener Diode Assorted Kit (30 Values, each 10 pcs, total 300 pcs)

Brand: Chanzon



10 * 1N4727A (3V)

10 * 1N4728A (3.3V)

10 * 1N4729A (3.6V)

10 * 1N4730A (3.9V)

10 * 1N4731A (4.3V)

10 * 1N4732A (4.7V)

10 * 1N4733A (5.1V)

10 * 1N4734A (5.6V)

10 * 1N4735A (6.2V)

10 * 1N4736A (6.8V)

10 * 1N4737A (7.5V)

10 * 1N4738A (8.2V)

10 * 1N4739A (9.1V)

10 * 1N4740A (10V)

10 * 1N4741A (11V)

10 * 1N4742A (12V)

10 * 1N4743A (13V)

10 * 1N4744A (15V)

10 * 1N4745A (16V)

10 * 1N4746A (18V)

10 * 1N4747A (20V)

10 * 1N4748A (22V)

10 * 1N4749A (24V)

10 * 1N4750A (27V)

10 * 1N4751A (30V)

10 * 1N4752A (33V)

10 * 1N4753A (36V)

10 * 1N4754A (39V)

10 * 1N4755A (43V)

10 * 1N4756A (47V)





Note:

Pack in a ESD Bag with Main Specs Label, for Long Time Protection and Indetification.



  • 1 Watt Zener Diodes Bag (Pack of 30 Values, Each 10 Pieces, Total 300 Pieces)
  • Lead-Free / RoHS Compliant Electronics Component / DO-41 Through Hole
  • 1N4727A 1N4727 3Volt / 1N4728A 1N4728 3.3Volt / 1N4729A 1N4729 3.6Volt / 1N4730A 1N4730 3.9Volt / 1N4731A 1N4731 4.3Volt / 1N4732A 1N4732 4.7Volt / 1N4733A 1N4733 5.1Volt / 1N4734A 1N4734 5.6Volt / 1N4735A 1N4735 6.2Volt / 1N4736A 1N4736 6.8Volt
  • 1N4737A 1N4737 7.5Volt / 1N4738A 1N4738 8.2Volt / 1N4739A 1N4739 9.1Volt / 1N4740A 1N4740 10Volt / 1N4741A 1N4741 11Volt / 1N4742A 1N4742 12Volt / 1N4743A 1N4743 13Volt / 1N4744A 1N4744 15Volt / 1N4745A 1N4745 16Volt / 1N4746A 1N4746 18Volt
  • 1N4747A 1N4747 20Volt / 1N4748A 1N4748 22Volt / 1N4749A 1N4749 24Volt / 1N4750A 1N4750 27Volt / 1N4751A 1N4751 30Volt / 1N4752A 1N4752 33Volt / 1N4753A 1N4753 36Volt / 1N4754A 1N4754 39Volt / 1N4755A 1N4755 43Volt / 1N4756A 1N4756 47Volt

User questions & answers

Question: este articulo es equivalente al zener diodo 1zb
Answer: Muy buena la oferta,muy buena calidad
Question: I’m seeing major voltage drop across the zener diodes. for my application i’m trying to put 12v through a 9.1v zener and i only get 3.45 volts out
Answer: 12 volts - 9 volts equals somewhere around 3 volts. I was under the impression the 9 volt zener diode would subtract 9 volts from your total voltage. I could be totally wrong.
Question: I’m seeing major voltage drop across the zener diodes. for my application i’m trying to put 12v through a 9.1v zener and i only get 3.45 volts out
Answer: You generally want to use a voltage regulator to bring the voltage down and then use a Zener diode at its output to stabilize the voltage output, not use the Zener itself as a voltage regulator. You would have to make sure the current through the diode does not pass around 110ma if you wanted to use it as a voltage regulator, since 1W/9.1V=.11A approximately, going over which would and likely did damage to it.

35 Pack 1N5349B 5W 12V Power Zener Diodes 1N5349 5 Watt 12 Volt Axial Diodes T-18 by Howrin

Based on 75 reviews Check latest price
  • Product Type:Zener Diode
  • P/N: 1N5349B
  • V(z): 12V
  • Power: 5W
  • Package Quantity: 35PCS

User questions & answers

Question: Is this diode rated for voltages up to 12V
Answer: Thank you for your question! Yes, his rated voltage is 12V.
Question: If my solar panel is putting out 20 volts will this prevent a car battery from overcharging
Answer: No. It is designed to allow voltage to travel in one direction only and not flow backwards. These are one way diodes.
Question: Can I use these diodes to break a ground loop on audio equipment
Answer: No, you should use a signal mode diode for that purpose.
Question: Can I use these diodes to prevent backfeed on a 12vdc trickle charger
Answer: Yes, no problem at all 。

Makeronics 300 pcs 0.5w Zener Diode Assortment 30 Values

Makeronics

Based on 20 reviews Check latest price

Product description

Specifications:

Power - Max: 0.5W

Tolerance: ±5%

Mounting Type: Through Hole, Axial

Package / Case: DO-41, Axial

Operating Temperature: -65 - 200°C



BZX55C 2V

BZX55C 2.2V

BZX55C 2.4V

BZX55C 2.7V

BZX55C 3V

BZX55C 3.3V

BZX55C 3.6V

BZX55C 3.9V

BZX55C 4.3V

BZX55C 4.7V

BZX55C 5.1V

BZX55C 5.6V

BZX55C 6.2V

BZX55C 6.8V

BZX55C 7.5V

BZX55C 8.2V

BZX55C 9.1V

BZX55C 10V

BZX55C 11V

BZX55C 12V

BZX55C 13V

BZX55C 15V

BZX55C 16V

BZX55C 18V

BZX55C 20V

BZX55C 22V

BZX55C 24V

BZX55C 27V

BZX55C 30V

BZX55C 39V

  • 2V to 39V .0.5 Watt Zener Diodes Assortment Set (Pack of 30 Values, Each 10 Pieces, Total 300 Pieces)
  • The assortments contain the following voltage: 2V 2.2V 2.4V 2.7V 3V 3.3V 3.6V 3.9V 4.3V 4.7V 5.1V 5.6V 6.2V 6.8V 7.5V 8.2V 9.1V 10V 11V 12V 13V 15V 16V 18V 20V 22V 24V 27V 30V 39V
  • These diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits.

Poilee 1N4004 Diode 1A 400V DO-41 Rectifier Diode Electronic Silicon Diodes (Pack of 50pcs)

PoiLee

Based on 165 reviews Check latest price

Product description

1N4004 1A 400V Rectifier Diode





Voltage - DC Reverse (Vr) (Max):400V;

Voltage - Forward (Vf) (Max) @ If:1V @ 1A

Current - Average Rectified (Io):1A;

Current - Reverse Leakage @ Vr:5μA @ 400V

Capacitance @ Vr, F:15pF @ 4V, 1MHz;

Speed:Standard Recovery >500ns, > 200mA (Io)

Mounting Type;Through Hole

Operating Temperature - Junction:-65°C ~ 150°C

  • 1N4004 Rectifier Diode.
  • Rated 400V at 1A.
  • High quality silicon diodes.
  • This product is widely used in product development, student experiments, maintenance, production, etc.

200 Pcs 10 Value Rectifier Diode 1N4001~1N5819 Zener Diode Assortment Kit

0713923580428

Based on 54 reviews Check latest price

Product description



200pcs 10 Value Rectifier Diode 1N4001~1N5819 Zener Diode Assortment Kit



Specifications:

Product Name : Diodes

Diode Voltage: 10V

Diode Current: 1A

Working Temperature: -55℃~+150℃

Usage:Suitable for many electronic projects hobbies and repairs, used in radios powers supplies and other devices.Suitable for many electronic projects hobbies and repairs, used in radios powers supplies and other devices.



Package Included:

1N4001 Rectifier Diodes---------20pcs

1N4002 Rectifier Diodes---------20pcs

1N4003 Rectifier Diodes---------20pcs

1N4004 Rectifier Diodes---------20pcs

1N4005 Rectifier Diodes---------20pcs

1N4006 Rectifier Diodes---------20pcs

1N4007 Rectifier Diodes---------20pcs

1N5817 Rectifier Diodes---------20pcs

1N5818 Rectifier Diodes---------20pcs

1N5819 Rectifier Diodes---------20pcs

Package Quantity: Total 200 pcs Rectifier Diodes



This set is organized by size in a transparent storage case for quick access and protection.

  • HIGH QUALITY:Diode provides low forward voltage drop, high current capability, high reliability and high surge current capability, Voltage: 10V, Current: 1A
  • DIODE RANGE:10 values each 20pcs including Standard Diode 4001 4002 4003 4004 4005 4006 4007 and Schottky Diodes 5817 5818 5819
  • PACKED:200pcs all come in a handy box with different molded area. Box will not break easily, parts inside will not slide or move around
  • LABEL:Each Rectifier Diode comes with label marked resistance for you to confirm value easily
  • USAGE:Suitable for many electronic projects hobbies and repairs, used in radios powers supplies and other devices.

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