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Old 10th April 2010, 08:31 PM   #171
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Default Apex hv350

Hv350 sch+pcb
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Old 11th April 2010, 10:43 AM   #172
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Hv350 pcb
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Old 11th April 2010, 11:14 AM   #173
AndrewT is offline AndrewT  Scotland
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Hi Apex,
could you point me to a description of the clip indicator operation?
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regards Andrew T.
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Old 11th April 2010, 11:14 AM   #174
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With new bias circuit on HV350, bias current can be setup at higer value than HV23. Also with new VI limiter there is no need for cut-out protect on PSU and protect PCB.
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Old 11th April 2010, 11:19 AM   #175
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Quote:
Originally Posted by AndrewT View Post
Hi Apex,
could you point me to a description of the clip indicator operation?
When peak output voltage is <12V to rail voltage clip led light on.
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Old 11th April 2010, 01:39 PM   #176
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Default Clip indicator

If no signal on the output of amplifier voltage on point 47k,22k,10R,10uF is 25V to the negative rail, BC546 is on and short circuit led diode, current go thru GND 10k1W CE of BC546 to negative rail. When voltage on output is about -65V (-75V rail voltage), voltage on point 47k,22k,10R,10uF is 10V to the negative rail, and in the point 22k,1k5,base BC546 is 0,6V to the negative rail, BC546 off current go thru GND 10k1W led to negative rail, and LED light. 10uF give some time delay for short peaks. Sorry for my English.
Regards Mile

Last edited by apexaudio; 11th April 2010 at 01:54 PM.
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Old 12th April 2010, 05:54 AM   #177
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I prefer stability in amplifier, who prefer value with 10pF instead 100pF amplifier have perfect square at 20kHz, but I do not recomended.
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Old 12th April 2010, 06:43 PM   #178
khalsa is offline khalsa  India
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hi apex kindly send me the pcb desin for #27 thanks

Last edited by khalsa; 12th April 2010 at 06:46 PM.
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Old 12th April 2010, 08:10 PM   #179
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hi apex kindly send me the pcb desin for #27 thanks
If you post some pictures of your diy work, I will consider about that.
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Old 13th April 2010, 02:34 AM   #180
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apex,
do you have quasi design for fets
i have a bunch of 2sk's
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