RE: choke input bias supply

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Posted by Paul Joppa (P) on March 2, 2015 at 21:41:54

In Reply to: choke input bias supply posted by hennfarm on March 2, 2015 at 14:11:14:

IIRC, Border Patrol made some SET power supplies like that, separate supplies for driver, output, and bias. This is ~20 years ago but they had an excellent reputation at the time; the one that I heard was very good indeed.

Hammond offers a small inexpensive choke of 150 henries at a few mA, so it's not that difficult to achieve critical inductance.

I admire the traditional ham radio notion that all choke input supplies should have bleeder resistors with low enough resistance to maintain the critical inductance, and with a large enough power rating that they would be the last component to fail.

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Follow Ups Full Thread

Topic - choke input bias supply - hennfarm 14:11:14 03/02/15 (16)

RE: choke input bias supply - Paul Joppa 21:41:54 03/02/15 (0)

Not Necessary - gusser 14:47:53 03/02/15 (1)

RE: Not Necessary - hennfarm 15:27:00 03/02/15 (0)

Even a half wave bias supply is perfectly quiet with just a cap - Chip647 14:42:45 03/02/15 (0)

RE: choke input bias supply - sony6060 14:33:26 03/02/15 (0)

Critical Henry - Triode_Kingdom 14:26:01 03/02/15 (2)

zackly... - PakProtector 18:29:57 03/02/15 (1)

but.... - PakProtector 06:09:00 03/10/15 (0)

RE: choke input bias supply - hennfarm 14:14:08 03/02/15 (7)

RE: choke input bias supply - Russ57 14:38:04 03/02/15 (6)

RE: choke input bias supply - amnesiac 05:11:50 03/03/15 (5)

RE: choke input bias supply - gusser 10:14:39 03/03/15 (4)

RE: choke input bias supply ARRL style - amnesiac 05:29:47 03/04/15 (3)

Different animal! - gusser 10:30:36 03/04/15 (2)

Regulated Bias - Triode_Kingdom 21:30:04 03/06/15 (1)

Can be done - Maxamillion 13:38:50 03/07/15 (0)

Follow Ups

RE: choke input bias supply - Paul Joppa 21:41:54 03/02/15 (0)

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