Hobby Electronics Basics

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Why is there foam tape on my amps heat sink

I have a 10 year old AV receiver that I opened to de-dust. I noticed that on the heat sink there a black foam material...
7 comments posted 13yrs
posted by N
7 comments posted 13yrs posted by N

Input impedance of a BJT in CE config

I'm designing a very simple (dummy I'd say) linear amp with a biasing network like the one shown in this image: http://...
16 comments posted 13yrs
posted by riccardomanfrin
16 comments posted 13yrs posted by riccardomanfrin

Darlington pair is two stage current amplifier

Darlington pair is actually two stage current amplifier. Now, there is new tutorial: http://www.cirvirlab.com/index.php...
1 comments posted 13yrs
posted by pchung705
1 comments posted 13yrs posted by pchung705

Evaluation of the square root of a complex matrix

Summary: How do I evaluate the square root of a complex matrix? I am studying from Pieter LD Abrie's "Design of RF and...
6 comments posted 13yrs
posted by grodzicky_j
6 comments posted 13yrs posted by grodzicky_j

remote control repair

My TV remote sees a lot of use and last winter the buttons had to be pressed very firmly to get them to work. As the we...
8 comments posted 13yrs
posted by defaulter_
8 comments posted 13yrs posted by defaulter_

Need an Isolation Transformer?

I needed isolation from the line today, it reminded me of something I learned while building a Cockcroft-Walton high vo...
7 comments posted 13yrs
posted by nojunk
7 comments posted 13yrs posted by nojunk

1N5819s? Or just a couple of 1N4001s?

I have been wanting to make use of a pair of 1N5819s to protect an RF amplifier I am building from static discharge, sh...
4 comments posted 13yrs
posted by db5151
4 comments posted 13yrs posted by db5151

Low-voltage rail for transistor bases?

Hello. When power transistors are used as switches, the base current can be significant, as the saturation beta may be...
5 comments posted 13yrs
posted by la
5 comments posted 13yrs posted by la

Antenna Lightning Protection

I have a mast, rotor and yagi TV antenna on my roof. The antenna is probably 15' feet above the roof. It has 12 or so l...
17 comments posted 13yrs
posted by wolftracks
17 comments posted 13yrs posted by wolftracks

A question about induction heaters

I've had occasion to work on some commercial induction heaters, and they all used water cooled induction coils. I was w...
4 comments posted 13yrs
posted by defaulter_
4 comments posted 13yrs posted by defaulter_

push-pull output simulation is ready

Push-pull output is most popular output stage for op-amps and audio power amplifiers. New tutorial: http://www.cirvirla...
3 comments posted 13yrs
posted by pchung705
3 comments posted 13yrs posted by pchung705

S-Parameters

If you have be stalled when confronted with a device model specified by S-Parameters, you should read the following col...
8 comments posted 13yrs
posted by To-Email-Use-The-Envelope-Icon
8 comments posted 13yrs posted by To-Email-Use-The-Envelope-Icon