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Revisiting some "old" ideas from 1970's - IPS, OPS
Revisiting some "old" ideas from 1970's - IPS, OPS
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Old 25th July 2015, 09:23 PM   #41
still4given is offline still4given  United States
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Revisiting some "old" ideas from 1970's - IPS, OPS
I noticed that on the new Leach Superamp I just finished the DC offset jumps around during the playing of music. There is no input cap. The amp seems to work just fine with great bass.

Thanks
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Old 26th July 2015, 02:12 PM   #42
antoniomora37 is offline antoniomora37
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Hi Valery


Your ideas seem to me very interesting, especially about VAS stage, may I suggest that you try the 2SC1775/2SA872 for the IPS stage, and the 2SA1360/2SC3423 for the VAS or as a low power Driver stage.
As a drivers the 2SD669/2SB649 and as you post earlier the Sanken's for output.
I made a lot of simulations on different circuits and this combination *give me *the best results.

Best regards
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Old 26th July 2015, 02:35 PM   #43
jwilhelm is offline jwilhelm  Canada
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Here's a single sided through hole version of CDC-VFA-SSC
Attached Images
File Type: png CDC-VFA-CCS 3D.PNG (333.8 KB, 611 views)
Attached Files
File Type: pdf CDC-VFA-CCS-2 TH Bottom.pdf (38.0 KB, 65 views)
File Type: pdf CDC-VFA-CCS-2 TH silk mirrored.pdf (47.0 KB, 60 views)
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Old 26th July 2015, 10:05 PM   #44
jwilhelm is offline jwilhelm  Canada
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I've got CDC-VFA-SYMM layed out. There's room to change D1 and D6 to SMT devices in needed.
Attached Images
File Type: png CDC-VFA-SYMM 3D.PNG (460.6 KB, 564 views)
File Type: png CDC-VFA-SYMM Board.PNG (95.4 KB, 533 views)
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Old 26th July 2015, 10:16 PM   #45
nigelwright7557 is offline nigelwright7557  United Kingdom
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Heres an old Maplin amplifier circuit from the 1980's.
It was 225WRMS into 4 ohms.
I used one on a mobile disco for many years.
With 4 off Fane 50WRMS speakers it sounded good and was very loud.
An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.
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Old 27th July 2015, 03:52 AM   #46
still4given is offline still4given  United States
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Revisiting some "old" ideas from 1970's - IPS, OPS
OK I etched some boards and will try to populate them tomorrow. I'm assuming that the CDC-CCS schematic matches this layout.

Blessings, Terry
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File Type: jpg CDC CFA CCS SILK.jpg (315.3 KB, 546 views)
File Type: jpg CDC CFA CCS FOIL.jpg (285.2 KB, 241 views)
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Old 27th July 2015, 05:26 AM   #47
still4given is offline still4given  United States
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Revisiting some "old" ideas from 1970's - IPS, OPS
Hi Guys,

Hopefully you see this sometime in the morning. Seems I need a little nudge in the right direction. Is the schematic in post 21 the correct one? If so are D2/D4 15v? Should I use BC550/560 or BC546/556 for the small transistors?

Thanks, Terry
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Old 27th July 2015, 10:22 AM   #48
jwilhelm is offline jwilhelm  Canada
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Quote:
Originally Posted by still4given View Post
Hi Guys,

Hopefully you see this sometime in the morning. Seems I need a little nudge in the right direction. Is the schematic in post 21 the correct one? If so are D2/D4 15v? Should I use BC550/560 or BC546/556 for the small transistors?

Thanks, Terry
D2/4 are 15V. I drew it up wit BC550/560 but either choice would likely be fine at 15V. The two TO-92 in the VAS section are 2n5401/5551 for the higher voltage.
Attached Files
File Type: pdf CDC-VFA-CCS-TH.pdf (95.5 KB, 133 views)

Last edited by jwilhelm; 27th July 2015 at 10:24 AM.
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Old 27th July 2015, 12:26 PM   #49
vzaichenko is offline vzaichenko  Russian Federation
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Revisiting some "old" ideas from 1970's - IPS, OPS
Quote:
Originally Posted by jwilhelm View Post
D2/4 are 15V. I drew it up wit BC550/560 but either choice would likely be fine at 15V. The two TO-92 in the VAS section are 2n5401/5551 for the higher voltage.
Absolutely correct. Q7, Q8 can also be either (550/560 or 546/556) as with +/-50V rails they only see some 35V c-e as a maximum.
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Old 27th July 2015, 01:01 PM   #50
vzaichenko is offline vzaichenko  Russian Federation
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Revisiting some "old" ideas from 1970's - IPS, OPS
Quote:
Originally Posted by antoniomora37 View Post
Hi Valery


Your ideas seem to me very interesting, especially about VAS stage, may I suggest that you try the 2SC1775/2SA872 for the IPS stage, and the 2SA1360/2SC3423 for the VAS or as a low power Driver stage.
As a drivers the 2SD669/2SB649 and as you post earlier the Sanken's for output.
I made a lot of simulations on different circuits and this combination *give me *the best results.

Best regards
Hi Antonio,

Thank you for the info, but 2SA1360/2SC3423 are rather rare in my area, and 2SC1775/2SA872 are nice low noise Hitachi devices, but simply impossible to get here (even Mouser doesn't sell them).

However, in case you've got the SPICE models for 2SA1360/2SC3423 - could you please share them? It would be interesting to try some simulations.

Cheers,
Valery
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