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Old 1st November 2013, 12:06 AM   #81
CeeVee is offline CeeVee  Portugal
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Thanks Juma,

No i intend to use your PSU.
With pre regulator isolated from cap multiplier, this will be in same pcb as preamp and buffer...it seems JC also likes this arrangement.

This is just because the box I've got is from an old Granger aeronautical transmitter...very small and compact, cast alu with internal division in the center....just right i think.

I'll post pictures when done.
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Old 8th November 2013, 05:39 PM   #82
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Here is an SMd version I am goign to have made. I have chosen to do the rectification section differently, as I will use a different transformer with dual windings. Want to try full dual mono as this is DIY and excess is the nature of the game. Super low noise stage should use low noise smd and susumu RG will be my choice.
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Old 8th November 2013, 07:11 PM   #83
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Full Monty according to Juma. Can post gerbers if anyone is interested in them.
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Old 9th November 2013, 02:37 PM   #84
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I have read that a pot at the output was suggested by Nelson at BAF. My question is whether or not we should follow it with another buffer?
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Old 9th November 2013, 02:39 PM   #85
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A Volume pot, you mean?
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Old 9th November 2013, 02:44 PM   #86
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One of only two possibilities when it comes to music.
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Old 9th November 2013, 03:03 PM   #87
juma is offline juma  Serbia
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Quote:
Originally Posted by buzzforb View Post
... a pot at the output...
Be careful with it:
1. have in mind that pot's total resistance will be in parallel connection with the resistor that sets the gain.

2.Your preamp will always work in full throttle mode so louder recordings or high level source component will drive it into clipping and you won't be able to do anything about it with the pot at the preamp's output...

3. buffer becomes mandatory after the pot since the 10k pot will (in worst case - at middle resistance position) represent 2.5k series resistance to the next stage (power amp)
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Old 9th November 2013, 03:07 PM   #88
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I would have assume a pot at the input, only asked because someone had commented as such in this thread.
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Old 9th November 2013, 04:56 PM   #89
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Nelson did suggest a pot on the output - I remember as it was I who asked. I think it's on the video...

The pot on the output has the advantage of attenuating the circuit noise as well - cool!

I like Juma's ideas, especially with the BJT on the output, and the buffer.
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Old 9th November 2013, 05:19 PM   #90
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by buzzforb View Post
I would have assume a pot at the input, only asked because someone had commented as such in this thread.
I intend to use a 10K trimmed muse on input.
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