Hobby Electronics Basics

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Need Voltage Doubler Circuit

I have a regen radio powered by two 23 volt wallwarts in series, but would like to use a 24 VAC transformer with a volt...
24 comments posted 18yrs
posted by the1930s
24 comments posted 18yrs posted by the1930s

BJT amplifier analysis

I was reading an analysis of this CE amplifier: http://xs126.xs.to/xs126/08174/complete168.png My problem with the anal...
7 comments posted 18yrs
posted by jerry
7 comments posted 18yrs posted by jerry

Jam Police Radar with Cold Plasma

Did you know an effective electrostatic generator can produce plasma? Well, if you get one of these electrostatic duste...
8 comments posted 18yrs
posted by elgersmad
8 comments posted 18yrs posted by elgersmad

Weak or strong pull

Hi All, What's the major difference between weak pull and strong pull ? Does that means different bias voltage ? Thanks....
3 comments posted 18yrs
posted by boki.digital
3 comments posted 18yrs posted by boki.digital

Why does this device need an OR-Gate?

The device listed at the link below automatically switch the output between either a 12V (really 13.8V) power supply or...
2 comments posted 18yrs
posted by 1qazse4
2 comments posted 18yrs posted by 1qazse4

Garage door alert

I'm in need of a garage door alert so there is a small red light in the house indicating it's open. I bought one made b...
18 comments posted 18yrs
posted by jag_manR__EM*-0_V_E653
18 comments posted 18yrs posted by jag_manR__EM*-0_V_E653

Power Adaptor Question (NEWBIE)

Before I go and start plugging things in I need to know this one thing. I have a Philips VOIP841, the power adaptors th...
6 comments posted 18yrs
posted by Derphy
6 comments posted 18yrs posted by Derphy

Soldering D-PAK Mosfet? (TO-252)

I'm using Fairchilds FCD5N60 in a D-PAK (TO-252). Data sheet http://www.fairchildsemi.com/ds/FC/FCD5N60.pdf The D-PAK I...
5 comments posted 18yrs
posted by spamme
5 comments posted 18yrs posted by spamme

the order in which some switches are turned on

Hi all, I have an array of N switches . Initially all are OFF. Somebody turns them ON in some order. It is possible tha...
1 comments posted 18yrs
posted by laura.brandusan
1 comments posted 18yrs posted by laura.brandusan

PIC processor interrupt for delayed output

What is the best approach to generate a delayed output from a trigger input to a PIC microcontroller? The idea is to ha...
10 comments posted 18yrs
posted by wrongaddress
10 comments posted 18yrs posted by wrongaddress

How to solve this circuit

I've found this circuit http://img521.imageshack.us/img521/8127/fasdgspi6.jpg but i don't konw how to obtain this result...
3 comments posted 18yrs
posted by lionelgreenstreet
3 comments posted 18yrs posted by lionelgreenstreet

Chip finder?

Is there a web site that will cross reference chip numbers? I have some older designs I would like to build, but the chi...
6 comments posted 18yrs
posted by aaron_stansbury
6 comments posted 18yrs posted by aaron_stansbury

Tube Amp

Hi, I'm looking for plans for a 1 or 2 tube low voltage amplifier to go with a regenerative radio. Does not have to be...
13 comments posted 18yrs
posted by the1930s
13 comments posted 18yrs posted by the1930s

Fan Motor

Sorry for such a simple question, but I've got a few 120mm 240V .125A (?30W) axial fans like a bigger version of the ca...
9 comments posted 18yrs
posted by spamfree
9 comments posted 18yrs posted by spamfree