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Referenz - high-quality low-cost diy-friendly amplifier
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Old 11th January 2019, 07:39 AM   #51
vzaichenko is offline vzaichenko  Russian Federation
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Referenz - high-quality low-cost diy-friendly amplifier
Quote:
Originally Posted by thimios View Post
Small progress, but many caps wrong named.
Do you mean - the schematic and the PCB's reference numbers don't match?
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Old 11th January 2019, 07:42 AM   #52
thimios is offline thimios  Greece
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Quote:
Originally Posted by vzaichenko View Post
Do you mean - the schematic and the PCB's reference numbers don't match?
Yes,but no problem.
The problem now is some missing parts...
I have a suggestion for the next version.
Led and transistor(CCS) in thermal contact.

Last edited by thimios; 11th January 2019 at 07:46 AM.
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Old 11th January 2019, 07:43 AM   #53
vzaichenko is offline vzaichenko  Russian Federation
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Referenz - high-quality low-cost diy-friendly amplifier
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Originally Posted by thimios View Post
Yes,but no problem.
I will check anyway
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Old 11th January 2019, 05:53 PM   #54
thimios is offline thimios  Greece
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Close to the finalize.
Still dirty.
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File Type: jpg IMG_20190111_194956.jpg (532.8 KB, 242 views)
File Type: jpg IMG_20190111_195509.jpg (592.2 KB, 244 views)

Last edited by thimios; 11th January 2019 at 05:58 PM.
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Old 11th January 2019, 05:58 PM   #55
jwilhelm is offline jwilhelm  Canada
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You better hold off on testing that Thimios. There is a mixup in the component designations. You may need to move some resistors around.
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Old 11th January 2019, 06:14 PM   #56
jwilhelm is offline jwilhelm  Canada
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Here's the schematic that matches your board. This has the incorrectly drawn servo connection.
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Old 11th January 2019, 06:47 PM   #57
thimios is offline thimios  Greece
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The flying resistor inside the black tube is the 56k.connected on the input transistors bases.
Is it any other resistor rearranging?

Last edited by thimios; 11th January 2019 at 06:55 PM.
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Old 11th January 2019, 06:57 PM   #58
jwilhelm is offline jwilhelm  Canada
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It looks like the resistor and diode numbering matches, just the capacitor numbering was wrong.
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Old 12th January 2019, 06:05 AM   #59
rhythmsandy is offline rhythmsandy
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Quote:
Originally Posted by vzaichenko View Post
Just replied above At 12mA it drives them fine (local heatsink is required for the drivers for keeping their temperature relatively constant). Expected rails are +/-50...55V DC.
You are super..! im still confused how its possible though..! ksc3503 delivering 12ma at what ambient temperature. Why cant we just stepup with higher capacity transistors? like 2sc5171 or 2sc4793? I believe it can be done though. Any thoughts of mosfets gate protection like adding some zeners in the OPS?
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Old 12th January 2019, 08:24 AM   #60
vzaichenko is offline vzaichenko  Russian Federation
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Referenz - high-quality low-cost diy-friendly amplifier
At 50V rails, each driver dissipates 12mA * 50V = 600mW, which is fine for TO-126 transistor, equipped with a local heatsink. The drivers run moderately warm, no problem. A big advantage of 3503/1382 - they are very "fast". Those are the Video transistors with fT = 150MHz and low capacitances.

More powerful drivers are normally "slower" - that may require some additional compensation. If you have read my post #47 carefully - I have mentioned there I even used 0381/0302 as drivers. In any case, with the higher fT you will require the lighter compensation and the higher performance.
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