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Old 16th April 2012, 04:07 PM   #691
Ghumbs is offline Ghumbs  United States
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Boards arrived and look great. Thanks Peter.
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Old 20th April 2012, 08:01 PM   #692
Villaw is offline Villaw  Cyprus
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Peter I am in for pcb 2 channels and psu
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Old 21st April 2012, 02:48 AM   #693
royf is offline royf  United States
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Peter I am still interested in psu pcb.

Roy
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Old 22nd April 2012, 11:50 PM   #694
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trying to bias the PD F5 board and when I reach .1V, the power supply voltage starts going down . when I reach .6v bias, the supply rails are reading about +- 9 V


any suggestions?
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Old 23rd April 2012, 09:36 AM   #695
AndrewT is offline AndrewT  Scotland
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What have you added to the PSU and the mains feed that is dropping that voltage?
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Old 23rd April 2012, 09:48 PM   #696
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sorry andrew, newbie mistake, I had the lightbulb draining the Voltage.

removed lightbulb and all good now. biased to .614 and .600 with 0 offset

though seems to lack some gain on 89db speakers.
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Old 23rd April 2012, 11:02 PM   #697
alazira is offline alazira  United States
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Quote:
Originally Posted by necplusultra View Post
sorry andrew, newbie mistake, I had the lightbulb draining the Voltage.

removed lightbulb and all good now. biased to .614 and .600 with 0 offset

though seems to lack some gain on 89db speakers.
Hi,
You can increase the gain by reducing the neg feedback (by increasing R5/R7 & R6/R8 from 2x100ohm to 2x200ohm and R1 & R2 from 10 ohm to 20 ohm)

See NP post: F5 power amplifier
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Old 23rd April 2012, 11:29 PM   #698
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Quote:
Originally Posted by Villaw View Post
Peter I am in for pcb 2 channels and psu
Quote:
Originally Posted by royf View Post
Peter I am still interested in psu pcb.
Roy
Both F5 and PS boards are available.
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Old 24th April 2012, 02:20 PM   #699
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by alazira View Post
Hi,
You can increase the gain by reducing the neg feedback (by increasing R5/R7 & R6/R8 from 2x100ohm to 2x200ohm and R1 & R2 from 10 ohm to 20 ohm)

See NP post: F5 power amplifier
no.
the gain is set by the ratio of those resistors.

Changing both, as you have shown, leaves the ratio exactly the same, i.e. the gain is the same.
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Old 24th April 2012, 04:37 PM   #700
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is it possible to convert the pd f5 stereo boards to mono balanced and if so, how?
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