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Questions tagged [substitution]

Involving or pertaining to electronic component or circuit substitution.

2
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1answer
24 views

Diode substitution for FMXG26S

I been hunting for an equivalent for a Diode in TV Power Supply - its a FMXG26S. Does anyone have any idea of an equivalent? Or where I can look one up? The datasheet advises the following for the ...
0
votes
0answers
15 views

Substitutability of thermal fuse

I have had this SW-104T thermal fuse blow on me. I'm not in a situation where I can obtain an the exact replacement, so I am wondering about the substitutability of thermal fuses. If I match the ...
0
votes
2answers
60 views

Passive Component ratings displayed on schematic - Use actual value or design requirement value?

When placing a passive component such as a cap or resistor on schematic, most people usually place the relevant rating (usually power for resistors, voltage for caps, and current for inductors) next ...
0
votes
1answer
46 views

Substituting solid wires for stranded

I have 100' of 2x7 (14) individually insulated 18 ga. solid conductors( I think it is communication cable) I would like to use in lieu of 16 ga. stranded wire for a gate opener. Is it doable?
1
vote
2answers
68 views

Wondering if I can change a cap value in a design

I am assembling a circuit from the ESP32 reference design. Looking at value C1 page 18 https://www.espressif.com/sites/default/files/documentation/esp-wroom-32_datasheet_en.pdf (10uF) but I don't ...
0
votes
1answer
184 views

Meter fuse availability/substitution conundrum

I own a Brymen BM235 multimeter, among other test instruments. While it's a nice multimeter, I have one problem with it: the fuse for the mA jack is a Siba 7017240.0,4, and nobody even bothers with ...
13
votes
2answers
3k views

Can a thyristor be built from two transistors?

Supposedly, an SCR/thyristor is just a simple, four layer PNPN semiconductor. If that's the case.. When a circuit calls for a SCR/thyristor, and there isn't one available, can it be substituted by (...
0
votes
1answer
51 views

Can I replace a NUP2105L voltage suppressor with a NUP3105L?

Someone gifted me a device to read electronic control units from cars and trucks. They gave it to me because they don't use it and they have also removed some components from it to fix another device. ...
3
votes
1answer
417 views

How would a transistor's hFE affect a phase shift oscillator?

I have a phase shift oscillator circuit from a drum machine that I would like to reproduce as faithfully to the original as possible. My problem is that the 40 year old design uses a transistor (...
1
vote
2answers
247 views

substituting transistors and diodes [closed]

I'm a new hobbyist, I need a tip 121 transistor and a 2N4148 diode. I'm using the site taydaelectronics.com. This site doesn't have these items. A friend tells me that there parts can probably be ...
4
votes
1answer
511 views

Can an X-class safety capacitor be used in series with a load (i.e. where steady current flows through it)?

Many applications that need a low voltage supply that is not isolated from the mains use a capacitive dropper circuit to get it -- an example is shown in the schematic below. simulate this circuit &...
0
votes
1answer
37 views

Slipping in an external adapter [duplicate]

I have an Atari 1040ST with a half-bad power supply - Along with two 5v Red wires that Are good, there is a Blue wire that requires 12v .9A (aka 9mA??) - With A/c on, it's measuring at 10.73v (on the ...
1
vote
1answer
2k views

Which MOSFETs can I use to replace these faulty obsolete ones?

I've had some transistors fail on a PCB, but I can no longer source them as they have long reached EOL and are now obsolete. The part numbers are as follows (linked to the original data sheets): ...
1
vote
1answer
1k views

SRU-12VDC-SD-C vs SRD-12VDC-SL-C

I'm following this guide [1] to made a Z-Wave compatible doorbell and it requires a SRU-12VDC-SD-C relay. I know nothing really of electronics and have found a SRD-12VDC-SL-C relay on Amazon [2] ...
1
vote
1answer
353 views

what is the use of ultrafast diodes in wireless battery charger ckt

Instructable I am working on a wireless charger that uses a ZVS Driver circuit for the transmitting end. This is its circuit diagram: I have attached the instructable where this came from. Wireless ...
0
votes
1answer
2k views

Replacing a 8 ohm Speaker with a Piezo. Will it work?

Like Replacing a piezoelectric speaker with an electromagnetic one, but the other way round. simulate this circuit – Schematic created using CircuitLab A DC squarewave will turn on and off ASW ...
0
votes
1answer
1k views

Identify/substitute an SMD MOSFET labeled “540N 88KFG” for LCD monitor repair

I'm trying to repair the logic board of an LCD monitor that died while giving off a burned smell. It seems that an LCD driver chip and a MOSFET (I think) burned out. The chip was easy to identify (...
0
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4answers
5k views

MCP602 alternative?

What can I substitute in place of the MCP602 in the following circuit? It is a pulse rate detector.MCP601/2/3/4 are not available where I live. I have attached the relevant instructable and the MCP602 ...
0
votes
2answers
921 views

What is the difference between the substitution principle and Thevenin theorem?

The substitution principle (as seen in this book; in italian, sorry) Let A and B be any two part of an electrical network with voltage and current sources and only resistances, connected by ...
2
votes
2answers
2k views

unusual transistor markings “C8550”

I am repairing a "wall-wart" charger for a Black and Decker battery powered edger which uses a 12 volt/7 amp hour battery. It has ceased to deliver charge current to the battery but the half wave ...
4
votes
2answers
1k views

How to choose an alternative for a specific BJT transistor?

I'm trying to reproduce some circuits with electronic pieces that I've at home. Unfortunately I miss some recommended transistors so I'm trying to understand how to replace them with an alternative ...
0
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2answers
7k views

Substituting capacitors

I have a nicely-spec'd wireless router that doesn't work any more. (Sorry, I don't have a schematic, but it's an Asus RT-N16.) I popped it open and found that it has one capacitor with a bulging top....
10
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4answers
4k views

No germanium diode available for small crystal radio — can active components handle the task?

I know that germanium diodes are trivial to find online, but as this is for a demonstration I'd rather not spend $6-7+ on shipping for a single 5 cent part for a project that's academic in exercise ...
4
votes
2answers
471 views

Is there a relevant difference between these capacitors?

I am planning to try designing a board that incorporates a switch-mode DC-DC converter, using this Texas Instruments reference design for their TPS54386PWPR ...
7
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4answers
12k views

Can I safely substitute a 4.7uF cap for a 5uF cap?

I'm working on a circuit that calls for a couple 5uF caps. I have 50v and 25v 4.7uF at my workbench. No cap voltage is specified in a schematic or parts list. The circuit has 12VDC coming in, one ...
3
votes
3answers
563 views

What is a secondary transformer?

On a number of projects I'm building, there's a transformer between wall power and device power. In the parts lists, the transformers are usually designated by "12v secondary transformer" or "18v 4a ...
0
votes
3answers
3k views

Can I substitute a mono potentiometer for a stereo one?

I have a PCB for a headphone amp that has a 6-hole pad for a single potentiometer. I've only got 3-pin ones in my box o' parts. Can I substitute the mono pot for the stereo pot, tie the sets of pads ...
14
votes
3answers
367 views

Question about long-term support for legacy board designs

This question is summarized from a discussion on the Electrical Engineering StackExchange chat. It is reproduced here in hopes to generate a discussion with long-term value Question for anyone with ...
3
votes
2answers
3k views

How do I determine if I can safely substitute potentiometers?

I've got a number of audio projects on the workbench, and of course, each of them requires different potentiometers. Instead of waiting for another box o' parts to arrive, can I substitute? What are ...