Hobby Electronics Basics

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Power output of TBA820M (audio amplifier chip)?

Does anyone know a formula for calculating the power output of the TBA820M audio amplifier IC? The data sheet gives the...
8 comments posted 9yrs
posted by a24061
8 comments posted 9yrs posted by a24061

Is this scheme reasonable?

I have an automatic opening trash can in the kitchen that runs off of batteries. I wanna run it with a wall wart. When...
49 comments posted 9yrs
posted by etpm
49 comments posted 9yrs posted by etpm

What is a load line - intuitively

http://pix.toile-libre.org/?img=1493527288.png That's a typical graph of Vce vs Ic for a bunch of Ib as provided by the...
10 comments posted 9yrs
posted by vek.m1234
10 comments posted 9yrs posted by vek.m1234

Transistor Hard Saturation - pg224 - Malvino

'A designer who wants a transistor to operate in the saturation region under all conditions often selects a base resist...
2 comments posted 9yrs
posted by vek.m1234
2 comments posted 9yrs posted by vek.m1234

connecting a VSD/VFD to an AC compressor

I was wondering about using a Variable Speed AC Drive for two air conditioners. One is a window unit, with rotary compr...
8 comments posted 9yrs
posted by default
8 comments posted 9yrs posted by default

PID tuning. Lag = ~ integrating time

Hi all, this is not so much a question, as me just spouting. If I do say (spout) something wrong, or that you disagree...
38 comments posted 9yrs
posted by gherold
38 comments posted 9yrs posted by gherold

Thermopile power supply in water heater control

I recently bought a gas water heater and made a point of getting one that didn't require external electrical power to o...
12 comments posted 9yrs
posted by bp
12 comments posted 9yrs posted by bp

one transistor amplifier help

I have the following amp. It originally had a 12V supply voltage, In an effort to get a larger swing on the output, I r...
21 comments posted 9yrs
posted by nojunk
21 comments posted 9yrs posted by nojunk

Mystery component marking

I have two versions of the same USB adapter module. One has what I believe is an SMD jumper marked "000". At the same pl...
2 comments posted 9yrs
posted by waybackNO584SPAM44
2 comments posted 9yrs posted by waybackNO584SPAM44

Slip ring questions

I'm sure someone here can help. I need to get power to a solenoid operated valve spinning at 5000 RPM. Low power, 24 vo...
16 comments posted 9yrs
posted by etpm
16 comments posted 9yrs posted by etpm

Variac question

All, I have two variacs, one is the typical type that does not isolate the load from the mains. The other one I have is...
16 comments posted 9yrs
posted by etpm
16 comments posted 9yrs posted by etpm

contact surface material

I made an exposed lid switch consisting of two mating pairs of flat brass s tock about 1 x 1/2 inches. When I close the...
14 comments posted 9yrs
posted by fritzo2ster
14 comments posted 9yrs posted by fritzo2ster

Bnc impedance

So I am using rg 62 coax which is 92 ohm. My BNC connectors are 75ohm.all my equipment inputs and outputs are 92ohm. Do...
20 comments posted 9yrs
posted by jfisher864
20 comments posted 9yrs posted by jfisher864