Electronic Components

Circuit ideas for undervoltage protection?

I recently became aware of a problem which I believe is seriously underestimated in a lot of designs: For most standard...

3 comments posted 21yrs

posted by amidumb

3 comments posted 21yrs posted by amidumb

Capacity of Duracell AA cell versus NiMH

How does the capacity of a Duracell-brand AA cell (Duracell ordinary or Duracell ultra) compare to one of the high-capa...

30 comments posted 21yrs

posted by noone

30 comments posted 21yrs posted by noone

Diode Dilemma!

Here's a question that bears some thought. The common 1N400x family of diodes is available in a wide range of breakdown...

9 comments posted 21yrs

posted by lenp

9 comments posted 21yrs posted by lenp

Genie and wizard ESR meters?

Hello, I'm about to buy a genie or wizard ESR meter and I was wondering if they can be used to test SMD capacitors? Any...

1 comments posted 21yrs

posted by paisleypcdoc

1 comments posted 21yrs posted by paisleypcdoc

Seeking TC58V64FT

Hello, i am seeking a source (germany prefered) where i can buy a small quantity of the TC58V64FT 8MB (8m x 8 3.3v CMOS...

0 comments posted 21yrs

posted by <katolla

0 comments posted 21yrs posted by <katolla

Unass'bl'd Heathkit Transistor Tester on Ebay

An unassembled Heathkit transistor tester alreadty has 9 bids and is over $200. Looks like kitbuilding is still a hobby...

4 comments posted 21yrs

posted by NOSPAM

4 comments posted 21yrs posted by NOSPAM

A Hand Cranked MagnetoGenerator

Greetings, I'm trying to locate information on the hand crank magneto generator used in vintage phones: how they were c...

21 comments posted 21yrs

posted by aaawelder

21 comments posted 21yrs posted by aaawelder

How long can a telephone extension-cord be?

Recently, at a Radio Shack store at the telephone accessories section, I noticed that telephone extension cords were av...

25 comments posted 21yrs

posted by wylbur37nospam

25 comments posted 21yrs posted by wylbur37nospam

Door annunciator...

I'm looking for a door annunciator...a simple, wired, line-powered one. Goes BONG when the door opens. Not battery-powe...

16 comments posted 21yrs

posted by wb8foz

16 comments posted 21yrs posted by wb8foz

No normal board

I've been having a look on the Radio Spares website (rswww.com) and I can't seem to find any normal board for soldering...

8 comments posted 21yrs

posted by big_bad_iceberg

8 comments posted 21yrs posted by big_bad_iceberg

Lattice-wound RF choke replacement, 50 years later

I'm fixing up some older ham transmitters. 811 or 6146 finals, etc. in the 50-200 watt class. Invariably these have sat...

14 comments posted 21yrs

posted by shoppa

14 comments posted 21yrs posted by shoppa

I'm looking for half controlled rectifier manufacturers

Dear Sirs/Madams, Can anybody give me the name of manufacturers that manufacture three phase half controlled rectifier m...

2 comments posted 21yrs

posted by gurayc_tr

2 comments posted 21yrs posted by gurayc_tr

voltage noise from batteries during discharge

Hi group, Is anyone aware of data on the voltage noise to be expected from the various chemical batteries (alkaline, Ni...

0 comments posted 21yrs

posted by clicliclic

0 comments posted 21yrs posted by clicliclic

24V, 2A supply?

Where's a good place to pick up a 24V, 2A (or better) power supply? A switcher would be nice, as would wall-mounting cap...

3 comments posted 21yrs

posted by

3 comments posted 21yrs posted by

KH-080B VHF power amplifier

Looking for a data sheet for a KH-080B VHF power amplifier This component is fitted to the Kyoto KG109 portable radios

0 comments posted 21yrs

posted by gencomm

0 comments posted 21yrs posted by gencomm