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#391 |
diyAudio Member
Join Date: Oct 2010
Location: Bucharest
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In the notes of building manual it written: "adjust with R5,R7 bias. If current is too low reduce resistors value ".
What is the targeted current to Q3,Q6 ? |
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#392 | |
diyAudio Member
Join Date: Mar 2011
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Quote:
I tried to get my head around the problem, but unfortunately it seems I lack the knowledge to do this on my own. Which resistors should i target and change to reduce the offset? But, there is also good news, I made another buffer with the transistors from the group buy, they work right away with 8 mV offset and can be easyly trimmed to zero offset. Thank you for the matching work. I wanted to ask how people power their buffers when it is not used with the paradise PSU. First I tried a TPA placid shunt regulator which worked, but with a loud hum that I could not get rid of. I tried different decoupling caps on the psu rails (220 uf elko, 10 uf elko, no cap) but the hum stayed. Then I used a LM317/37 regulator and it worked flawlessly with out hum. Is there an obvious reason, why the Placid shunt results in a strong hum in this application? I would probably try the buffer with a Salas regulator Did anyone try this already and can comment on how to decouple this properly? I thought about maybe a small elko or a small film cap with serial R? Any help appreciated. By the way, the sound is excellent ![]() Regards Florian |
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#393 |
diyAudio Member
Join Date: Jul 2006
Location: Hong Kong
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Anyone got a spare stereo set (or two) of pcb for sale?
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Sources: sdtrans384 + syncDAC w/ OTA IV; Soekris R2R DAC*; SBT+ Audial Model S 1541A DAC. Amps: PTT2S, 26/01A* DHT pre; 42, 45 SETs, 45 PP,Wiener.Speakers: Linkwitz Lxmini*; EMI 319 + AMT;Jensen SG300; vintage FRs for FAST, & Rullit field coils.*upgrading |
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#394 |
diyAudio Member
Join Date: Oct 2010
Location: Bucharest
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#395 |
diyAudio Member
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Hi atupi,
the current through the complete circuit is approximately 30 mA. Let's say 5 mA for the JFETs. So you need about 25 mA for the BJTs. |
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#396 | |
diyAudio Member
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Quote:
In short, don't change too much - if you want changes, you may want to simulate the circuit first, then try it out and measure the distortion, and see if you can get to the same magnitude Calvin did. Hope that helps.....
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Paradise documents are here: Link list |
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#397 |
diyAudio Member
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Are there any boards left for these?
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Paradise Pre-reg PSU PCBs |
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#398 |
diyAudio Member
Join Date: Jul 2013
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You can have mine, unopened, unused
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#399 |
diyAudio Member
Join Date: Sep 2008
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I'm looking for a pair of boards as well. Thanks!
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#400 |
diyAudio Member
Join Date: Oct 2010
Location: Burlington, NC
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I have 4 pairs of what was the first batch
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...Shape the sound , Man! |
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