Involving or pertaining to electronic component or circuit substitution.

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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 ...
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240 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): ...
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410 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] ...
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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. ...
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252 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 ...
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419 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 (...
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1k 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 ...
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424 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 ...
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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 ...
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2answers
443 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 ...
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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....
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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 ...
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343 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 ...
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4answers
5k 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 ...
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3answers
462 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 ...
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3answers
1k 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 ...
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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 ...
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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 ...