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Very Simple Hybrid Ampifier
Very Simple Hybrid Ampifier
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Old 22nd August 2018, 02:31 PM   #501
thimios is offline thimios  Greece
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Join Date: Aug 2009
Location: Agrinion
Default VSHA+I-AMP

Power supply=/-42V
Inp sensivity=130mV
Vout=26v RMS/6R
Pout=112W RMS.
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Last edited by thimios; 22nd August 2018 at 03:01 PM.
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Old 23rd August 2018, 03:07 PM   #502
thimios is offline thimios  Greece
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I wonder if this giant gain is in agreement with the Peter's plan.
I hope that Peter will answer soon.
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Old 19th September 2018, 02:13 PM   #503
thimios is offline thimios  Greece
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No answer?
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Old 18th October 2018, 07:34 AM   #504
borys is offline borys  Ireland
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Location: Mallow
Hi thimios

Very nice work as allways !!

Sorry for the delay, I am doing some major home renovation now and all my free time is gone
I hope next year Ill have some time for more DIY kind of work.

The voltage gain is huge (around 47 times) the plan was to use the amplifier without any preamplifier. Another thing is that the two ''cascoded'' differential amplifiers (one formed by ecc88 and second with two trannies) have really huge open loop gain so at the time I was playing with the circuit it was hard for me to tame it with a proper compensation.
If Ill have some more free time Ill try to rework the compensation to lower the total voltage gain of the amplifier.
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Last edited by borys; 18th October 2018 at 07:37 AM.
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Old 11th November 2018, 01:05 PM   #505
mllum is offline mllum  Malaysia
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Quote:
Originally Posted by borys View Post
The HD version for 12au7 tube is bellow (same as post no #23), heater is 6.3V ac , but you can cut one track and make it for 12DC.

I didn't have any problems with it but had some with 6n16b tube and had to add another compensation cap.
Just in case I have made a tests on v4 version too with additional miller cap at tranistor T1, amp is rock stable, no changes in performance.

Bellow few squares and triangles from it (2 x 47pF miller caps at the VAS stage)

Hi, I am a newbie in building solid state equipment, especially power amps. I am interested to build the VSHA classic because it is a ready tested design with the necessary files to fabricate the pcb.

From studying the schematic for the output stage, it appears that the mosfet source followers are biased by the 4 1n4148 diodes; so as to give approximately 2.4 to 2.6 volts across the gates of the n channel mosfet and the p channel mosfets.


Purpose of the 1k multiturn pot trimmer appears to me as being for further adjusting the bias voltage across the 2 gates by reducing the voltage between the 2 gates.

This is probably a stupid question to all you experienced builders here; but if I may ask, how is the voltage offset at the sources of the 2 mosfets trimmed to 0 volts? as there does not appear to be any off set adjustment?

I know that the 2 halves of each triode is not a perfect match and can never be. So how does one ensure that there is 0 volt offset at the output.

Perhaps someone can explain the output schematic to me.

Thanks
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Old 18th June 2019, 09:07 AM   #506
thimios is offline thimios  Greece
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Default i-AMP100

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Old 18th June 2019, 01:30 PM   #507
thimios is offline thimios  Greece
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Join Date: Aug 2009
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Default i-AMP100

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Old 20th June 2019, 12:54 AM   #508
still4given is offline still4given  United States
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Very Simple Hybrid Ampifier
That's pretty cool!
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Old 20th June 2019, 01:25 AM   #509
gaborbela is offline gaborbela  Canada
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Nice build!
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Old 20th June 2019, 06:30 AM   #510
thimios is offline thimios  Greece
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Thanks guys.
Really wonderful!
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