Hobby Electronics Basics

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Building DC Voltmeter

I'm wanting to built a DC volmeter from a moving coil ammeter. I have all the info and can calculate the series resitst...
4 comments posted 19yrs
posted by vwq47
4 comments posted 19yrs posted by vwq47

What's happening with this xmitter in a pipe?

Greetings All, I had to drop a camera down a 6 inch diameter steel well casing to see what was going on. I used one of...
3 comments posted 19yrs
posted by etpm
3 comments posted 19yrs posted by etpm

Single supply and split / dual supply

Hello. Is it true that all split or dual supply opamps can be operated in single supply mode, but the inverse is not tru...
4 comments posted 19yrs
posted by mr.whatever
4 comments posted 19yrs posted by mr.whatever

Is this float switch circuit really all I need?

I need to turn on a solenoid valve to let water in to a container whilst a float switch is down (n/c configuration). I...
3 comments posted 19yrs
posted by mmcnospam
3 comments posted 19yrs posted by mmcnospam

photo flash capacitors

where can i buy photo flash capacitors in the uk?
1 comments posted 19yrs
posted by davesuejon
1 comments posted 19yrs posted by davesuejon

Capacitor coupling question

I have have a question about how capacitors couple ac signals. I'll explain what I think is happenning and see if it's...
11 comments posted 19yrs
posted by jim_fen05
11 comments posted 19yrs posted by jim_fen05

A couple more motor control questions - Braking

I've been doing some research about braking a DC motor. I am building an electric model train, and I will definitely ne...
12 comments posted 19yrs
posted by echinos
12 comments posted 19yrs posted by echinos

Piezoelectric transducers

Hi, I am a student of ME. I am doing my final year project on piezoelectric in shoes. Piezoelectric is located in shoes...
2 comments posted 19yrs
posted by arjav1ec
2 comments posted 19yrs posted by arjav1ec

Surge / overvoltage input protection?

Hi. I've read some articles about surge input protection; I think it was regarding switches. Basically, they had a diod...
9 comments posted 19yrs
posted by mr.whatever
9 comments posted 19yrs posted by mr.whatever

50 ohm load

I'm studying op-amp circuit combined with rf mixer. While I was reading articles on the circuit,I found that the term l...
27 comments posted 19yrs
posted by sperelat
27 comments posted 19yrs posted by sperelat

laser

Is there any conection between laser and infra red? Or rather can you reproduce IR in laser form?
3 comments posted 19yrs
posted by muhatioscar
3 comments posted 19yrs posted by muhatioscar