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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: RE: FWIW posted by cpotl on February 19, 2014 at 08:57:24:
The Futtermans I have seen employ an *actual* coupling cap in addition to the 'coupling caps' in the power supply. So we can look at the Circlotron has having 'one less'.
Another method of sorting out if a coupling cap exists is to examine the DC capabilities of the circuit. If a coupling cap is present the circuit will have a timing constant that will prevent DC response. We don't see that in the Circlotron- the output is capable of holding DC levels indefinitely, in fact requires a DC offset control system due to the lack of a coupling cap. So I've always seen this as a 'cake and eat it too' sort of thing; if you have a coupling cap you don't have DC response. This is of course a pragmatic viewpoint, I am sure stricter definitions exist!
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Follow Ups
- RE: FWIW - Ralph 11:45:42 02/19/14 (14)
- RE: FWIW - cpotl 19:04:19 02/19/14 (13)
- RE: FWIW - Ralph 09:03:26 02/20/14 (12)
- RE: FWIW - cpotl 09:49:48 02/20/14 (11)
- RE: FWIW - Banat 12:58:26 02/20/14 (4)
- RE: FWIW - cpotl 13:52:05 02/20/14 (3)
- Chris, Thanks for the comment on AC and DC currents - Lew 12:29:40 02/20/14 (0)
- RE: FWIW - Ralph 10:55:32 02/20/14 (3)
- What I was thinking too: much larger cathode resistors,... - Lew 12:28:15 02/20/14 (2)
- not so fast- - Ralph 12:56:42 02/20/14 (1)
- Yes, thought of that too, - Lew 14:32:56 02/20/14 (0)
- RE: FWIW - tyu 10:51:12 02/20/14 (0)
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