I found a circuit on the web that uses a 24 volt transformer and a voltage doubler to provide the -32 volts I need. Assembled everything and was able after a few adjustments to get the necessary voltage. Hooked it up to the secondary of the interstage transformer I intend to use and the voltage fell to -0.4 volts. The secondary only measures 400 ohms so what else might account for this drastic drop in voltage? Thanks for any help, this one really puzzles me!
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Topic - Negative bias supply problems - vetmedrobert@gmail.com 15:43:44 06/25/17 (21)
- RE: Negative bias supply problems - vetmedrobert@gmail.com 09:03:05 06/26/17 (11)
- So you are getting proper negative voltage on the grids? (n/t) - FenderLover 09:13:17 06/27/17 (1)
- RE: So you are getting proper negative voltage on the grids? (n/t) - vetmedrobert@gmail.com 09:31:29 06/27/17 (0)
- RE: Negative bias supply problems - Triode_Kingdom 11:31:51 06/26/17 (8)
- Yep, In his original post - Chip647 12:40:16 06/26/17 (7)
- RE: Yep, In his original post - Triode_Kingdom 13:07:18 06/26/17 (6)
- That is why no one could figure it out. Inconsistent. (nt) - Chip647 16:20:40 06/26/17 (5)
- No kidding - Triode_Kingdom 13:20:20 06/27/17 (1)
- RE: No kidding - vetmedrobert@gmail.com 14:14:29 06/27/17 (0)
- RE: That is why no one could figure it out. Inconsistent. (nt) - vetmedrobert@gmail.com 09:38:10 06/27/17 (2)
- 400 ohms/0.4 volts gives 1 ma of current - Tre' 11:16:18 06/27/17 (1)
- RE: 400 ohms/0.4 volts gives 1 ma of current - vetmedrobert@gmail.com 12:50:57 06/27/17 (0)
- RE: Negative bias supply problems - TomWh 08:32:39 06/26/17 (0)
- RE: Negative bias supply problems - Triode_Kingdom 21:32:01 06/25/17 (0)
- RE: Negative bias supply problems - FenderLover 18:24:21 06/25/17 (0)
- RE: Negative bias supply problems - Paul Joppa 17:57:06 06/25/17 (5)
- RE: Negative bias supply problems - vetmedrobert@gmail.com 06:29:09 06/26/17 (4)
- Calculation - PakProtector 09:09:35 06/26/17 (1)
- RE: Calculation - vetmedrobert@gmail.com 09:42:36 06/27/17 (0)
- Voltage doubler seems correct - FenderLover 07:06:15 06/26/17 (1)
- RE: Voltage doubler seems correct - vetmedrobert@gmail.com 08:20:18 06/26/17 (0)