RE: Michael, to split hairs...

Posted by Michael Koster (M) on April 8, 2010 at 08:11:19

In Reply to: Michael, to split hairs... posted by Allen Wright on April 8, 2010 at 06:13:59:

"A classic mU output is per Alan Kimmel, and needs a extra cap to allow a large resistor between the lower anode and the upper cathode."

I like splitting hairs though. Here's what Broskie says about the same (single resistor) circuit:

" This circuit has many names: SRPP, SEPP, Totem Pole, Mu Follower, Mu amplifier, Cascoded Cathode Follower, and its original name, the Series-Balanced amplifier (Feb. 1943, US patent 2,310,342. Just what "SRPP" means is uncertain; maybe it stands for Series Regulated Push-Pull amplifier or Single-Ended Reflexive Push-Pull amplifier. "

I guess the connection could be called "the follower connection"...

Anything you do to increase the resistance between bottom and top devices will decrease the output impedance at the "follower" output.

Another way to use a larger source-to-plate (cathode-to-plate) resistor is the constant voltage or gyrator circuit, upper left on my diagram, which also has a low impedance output at the top of the resistor. Broskie calls it "fixed bias SRPP"

Cheers,

Michael

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Follow Ups Full Thread

Topic - impedence of CCS mu output - bobbyj 16:55:01 04/7/10 (27)

RE: impedence of CCS mu output - VT4C211 17:26:36 04/11/10 (4)

RE: impedence of CCS mu output - dave slagle 21:18:39 04/11/10 (3)

RE: impedence of CCS mu output - VT4C211 21:29:48 04/12/10 (2)

RE: impedence of CCS mu output - Michael Koster 23:50:46 04/12/10 (1)

RE: impedence of CCS mu output - VT4C211 19:01:53 04/15/10 (0)

RE: impedence of CCS mu output - Michael Koster 22:56:52 04/7/10 (13)

RE: impedence of CCS mu output - Mike C 12:34:59 04/12/10 (1)

RE: impedence of CCS mu output - Michael Koster 10:14:57 04/14/10 (0)

RE: impedence of CCS mu output - bobbyj 11:22:37 04/8/10 (3)

RE: impedence of CCS mu output - Michael Koster 12:57:26 04/8/10 (2)

RE: impedence of CCS mu output - Satanpatiently 14:33:37 04/8/10 (1)

RE: impedence of CCS mu output - Michael Koster 08:02:47 04/9/10 (0)

Thank you for that great explanation. nt - Tre' 10:14:22 04/8/10 (0)

Michael, to split hairs... - Allen Wright 06:13:59 04/8/10 (1)

RE: Michael, to split hairs... - Michael Koster 04/8/1008:11:19 04/8/10 (0)

RE: impedence of CCS mu output - Joao 23:52:51 04/7/10 (3)

RE: impedence of CCS mu output - Michael Koster 10:06:33 04/8/10 (2)

RE: impedence of CCS mu output - reVintage 05:19:52 04/10/10 (1)

RE: impedence of CCS mu output - Michael Koster 08:24:29 04/10/10 (0)

RE: impedence of CCS mu output - Tre' 17:04:47 04/7/10 (7)

RE: impedence of CCS mu output - bobbyj 18:24:37 04/7/10 (6)

RE: impedence of CCS mu output - Tre' 18:57:48 04/7/10 (5)

RE: impedence of CCS mu output - bobbyj 20:18:13 04/7/10 (3)

RE: impedence of CCS mu output - Tre' 20:40:39 04/7/10 (2)

RE: impedence of CCS mu output - bobbyj 10:15:02 04/8/10 (1)

RE: impedence of CCS mu output - Tre' 10:20:13 04/8/10 (0)

Here's a helpful calculator - Tre' 19:02:17 04/7/10 (0)

Follow Ups

RE: Michael, to split hairs... - Michael Koster 04/8/1008:11:19 04/8/10 (0)

RE: Michael, to split hairs...

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