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Folsom EC7293: PVI Powered Frontend, 60/120w 8/4ohm
Folsom EC7293: PVI Powered Frontend, 60/120w 8/4ohm
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Old 8th October 2020, 08:03 AM   #301
mctavish is offline mctavish  Austria
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So I got the boards assembled last night! Everything went well, some of the resistore had to be mounted vertically due to space issues.

The one thing that was a bit of a challenge was the transistors....

I have been soldering for 30 years or so and I still had to really concentrate and pull out all of my bag of tricks to get them all soldered on!

The one thing missing is the cap that comes after the solar cells... What value and voltage should that be?

Now I am just waiting on the Leds, Solar cells, and the power trafos. I am thinking about Toroidy as I have had good experiences with them in the past.

Thanks again Jeremy for the great design!!
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Old 8th October 2020, 09:49 PM   #302
zek is offline zek
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Why did you bend the legs of small transistors?
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Old 9th October 2020, 06:29 AM   #303
mctavish is offline mctavish  Austria
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Because there are no through holes on the PCB for the transistors, there are only flat pads. Plated through holes would have made it a lot easier, for some reason this design just has three flat soldering Pads....
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Old 9th October 2020, 08:39 PM   #304
zek is offline zek
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That's really weird.
If it’s a single-layer board, I’d drill holes in it for those little transistors.
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Old 10th October 2020, 01:17 AM   #305
Destroyer OS is offline Destroyer OS  United States
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Do NOT drill the board.
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Old 10th October 2020, 01:22 AM   #306
Destroyer OS is offline Destroyer OS  United States
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Quote:
Originally Posted by mctavish View Post
So I got the boards assembled last night! Everything went well, some of the resistore had to be mounted vertically due to space issues.

The one thing that was a bit of a challenge was the transistors....

I have been soldering for 30 years or so and I still had to really concentrate and pull out all of my bag of tricks to get them all soldered on!

The one thing missing is the cap that comes after the solar cells... What value and voltage should that be?

Now I am just waiting on the Leds, Solar cells, and the power trafos. I am thinking about Toroidy as I have had good experiences with them in the past.

Thanks again Jeremy for the great design!!
680-1000uf 16vmin, same size as feedback will fit.

Glad you were able to solder transistors. This wasn’t intended for a beginner project. The way I do it is to carefully trim the leads first, pool a little solder on the back leg pad, and try to tin the back leg real quick. Then hold the transistor where you want it and heat the pad, the leg will sit down in the pool onto the pad. You can just just solder the other joints like anything else. It doesn’t feel out perfect but is repeatable.
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Old 29th October 2020, 12:59 PM   #307
mctavish is offline mctavish  Austria
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So I have found a killer deal on some toroidal trafos that are overstock. They are 300va but they have 30v secondaries.

Would 30v. secondaries be to far out of line for the voltages on the boards or would they still be usable?

Thanks guys!
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Old 29th October 2020, 07:56 PM   #308
Destroyer OS is offline Destroyer OS  United States
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It would mean the capacitors that were in the BOM would be insufficient for handling the voltage on them. But yes you could run that high as long as you have adequate heatsinks.
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Old 31st October 2020, 01:50 PM   #309
jameshillj is offline jameshillj  Australia
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I'm slowly ploughing thru the threads about this amp, the basic power supply and the Fo-Felix line filter and kept on coming across the reference to this "Antipole Power Supply" and wondered what it was?

Then, on Audio Circle, it seems to be part of the design of the 7297 chip amp's supply - it appears to be a cap multiplier p/s filter but I don't see any mention of it - doesn't it work here?
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Old 31st October 2020, 04:05 PM   #310
Destroyer OS is offline Destroyer OS  United States
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The Antipole is just a single rail PSU.
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