Hobby Electronics Basics

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LM 393 switching soft

Hi guys, hope someone can help. I've got a LM393 on a 12v supply measuring a thermistor. I've got it switching around t...
22 comments posted 17yrs
posted by Terminal_Crazy
22 comments posted 17yrs posted by Terminal_Crazy

MacBook 13" charger circuit

I have a MacBook 13" (not under warranty). When the charger is connected it does not light or charge the battery. I hav...
9 comments posted 17yrs
posted by N
9 comments posted 17yrs posted by N

Make X100 'scope probe from X10

I've been measuring a lot of small capacitances (C) lately, I've been using this old TEK X10 'scope probe with 8.5 pF o...
2 comments posted 17yrs
posted by ggherold
2 comments posted 17yrs posted by ggherold

Is this electrolyte leakage?

Cap at top center: Or just marking? The red stuff seems to have substance to it (more than just ink)... No bulging, or l...
8 comments posted 17yrs
posted by me
8 comments posted 17yrs posted by me

LTSpice and OpAmp Oscillation

I've built a discrete transistor OpAmp, and when the input was off, I saw it oscillating. So, I got interested in OpAmp...
3 comments posted 17yrs
posted by mhelshou
3 comments posted 17yrs posted by mhelshou

LC tank circuit at resonance

hello, I have been reading on the LC parallel tank circuit. I have installed on my breadboard an inductor and a small A...
7 comments posted 17yrs
posted by lerameur
7 comments posted 17yrs posted by lerameur

Z80 reset circuit

I need to make up a reset circuit to reset, on power on, a Z80 (old 40-pin DIP type) and a few TTLs. I don't want to ma...
25 comments posted 17yrs
posted by jamma-plusser
25 comments posted 17yrs posted by jamma-plusser

inductor substitution

I have an small electric motor that has some kind of speed control pcb attached to it. There are two inductors manufact...
3 comments posted 17yrs
posted by uriahsky
3 comments posted 17yrs posted by uriahsky

Max Rise/Fall time question CMOS inputs

Question about long rise and fall times for the Set/Reset/Data input lines to the CD4013 dual D flip flop. The data she...
4 comments posted 17yrs
posted by wrongaddress
4 comments posted 17yrs posted by wrongaddress

New Book about Radio and Electronics

SolderSmoke -- A Global Adventure in Radio Electronics From Crystal Radios to Podcast MP3s With Occasional Forays into...
0 comments posted 17yrs
posted by bill.meara
0 comments posted 17yrs posted by bill.meara

Frequency of A Common Circuit

L1q1''(t) + L3q1'(t) + L3R2[q1'(t) - q2'(t)] + q1(t)/C1 + (q1(t)-q2 (t))/C2 = En sin (omega t) L2q2''(t) + L3R2 (q2'(t)...
1 comments posted 17yrs
posted by BretCahill
1 comments posted 17yrs posted by BretCahill