Everything for Electronics

Unanswered Questions





Relay Diodes 2019 Issue-6

I sometimes see a diode placed across relay contacts backwards. Can someone explain the purpose of this and when it’s necessary and when it’s not and why?

#06194
Jürgen Abend
Pleasanton, CA


Transistor Confusion 2019 Issue-6

What determines which type of transistor to use in a given circuit? Are they interchangeable with those of a different type that I may already have on hand?

#06193
Donald Bodine
Middleham, UK


LED Fader 2019 Issue-6

I need a simple method to slowly fade an LED from bright to dim, then to bright again in about two seconds, then keep repeating. Does anyone have a circuit that does not require an IC?

#06192
Cindi Carrillo
Lexington, KY


Ripple Voltage Monitor 2019 Issue-6

I need a circuit to monitor the AC ripple voltage on a 12 volt linear power supply? A digital display would be ideal.

#06191
Brian Lambdin
Plano, TX


Diesel Computer Mods 2019 Issue-5

There are several entities that will modify the settings on the engine control computer for a diesel Chevy pickup to increase power. I assume they are adjusting the timing curves and other parameters. Is there an adapter and software available for me to experiment with this myself?

#05195
Karel Dostál
Covina, CA


Car Detection 2019 Issue-5

I’m looking for help designing a circuit to detect cars driving up my private road. I have in mind something like the wire loop embedded in roads to sense cars at a traffic light. Can you explain the principle behind this method and how a basic DIY version might be implemented?

#05194
Ulrike Krüger
Laconia, NH


Triangle Waves 2019 Issue-5

I need a circuit to generate a triangle wave from zero to five volts.

#05193
Charles A. Parham
Galveston, TX


Guitar Tuner 2019 Issue-5

I’m trying to build an electronic guitar tuner. Is there an IC available to generate the proper tones?

#05192
Hamish Morisset
Norcross, GA


Dish Projects Wanted 2019 Issue-5

I have a couple of small satellite dishes (Direct TV I think) with receivers that have been sitting in the garage for a while. I hate to throw out technology that could be repurposed. Anyone have an idea for a cool DIY project I could reuse them for?

#05191
Devin Martel
Durham, NC


Solar Panels And Lightning 2019 Issue-4

Are solar panels suceptable to damage by nearby lightning strikes and would they provide any margin of safety to electronic equipment in a grid-tied or off-grid system?

#04193
Alex Freeleagus
Tigard, OR

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