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Old 31st May 2019, 11:42 AM   #21
badboy6120 is offline badboy6120  Malaysia
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Quote:
Originally Posted by manojtm View Post
by removing 1nf cap from pin 2 of TL071 there would be around rail voltage at output
also disconnecting pin 2 of TL071 from feedback will cause no signl in output
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Old 31st May 2019, 12:03 PM   #22
manojtm is offline manojtm  India
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Hi,
Quote:
I don't know why but I get about 185KH frequency with 1K resistor and 135KH with 560 ohms resistor
with 1k resistor:
with good coil your freq. will go high up to 435KHz (same MOSFET)

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Old 31st May 2019, 12:06 PM   #23
manojtm is offline manojtm  India
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Hi,
Quote:
by removing 1nf cap from pin 2 of TL071 there would be around rail voltage at output
also disconnecting pin 2 of TL071 from feedback will cause no signl in output
Sorry the FB link erased. its my mistake connect FB and remove 1nF cap

without 1nF cap, with your coil you get approx. 235KHz

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MANOJ
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Old 31st May 2019, 12:10 PM   #24
badboy6120 is offline badboy6120  Malaysia
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Quote:
Originally Posted by manojtm View Post
Hi,

with good coil your freq. will go high up to 435KHz (same MOSFET)

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MANOJ
I have T106-2 core
how much turn on it to test the frequency problem?
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Old 31st May 2019, 12:45 PM   #25
badboy6120 is offline badboy6120  Malaysia
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Reduced the ETD39 turns to 20 and now I get about 250KHZ with 1kohm resistor(lower value will decrease frequency)
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Old 31st May 2019, 06:07 PM   #26
badboy6120 is offline badboy6120  Malaysia
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I think that 14 Volts drops in output voltage is dissapated in output core winding because it gets really hot in a few second
can I use multiple threaded wire gauge like 0.25mm
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Old 1st June 2019, 06:24 PM   #27
badboy6120 is offline badboy6120  Malaysia
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Hi dear manoj
I use T106-2 core with 60 turns of 0.75 wire and 3uf output cap and with these value the output signal is the cleanest and the sound is so clean
as I said before by increasing the 1K resistor I can increase the frequency, so I go higher than 1K and now I have 250kHz frequency
do you think that there might be some problem with my amp?
I ordered T157-2 and I will be using it for my 800W amps

I'll appreciate your help
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Old 3rd June 2019, 11:41 AM   #28
manojtm is offline manojtm  India
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Quote:
T106-2 core with 60 turns
47uH it is too high(not bad) use 33uH or 22uH it is good( you will get more current on output)22uH is best.

Quote:
I get about 250KHZ with 1kohm resistor(lower value will decrease frequency)
Yes. (for better reliability use below 1K. otherwise unwanted oscillation will occur.)

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MANOJ
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Old 3rd June 2019, 12:00 PM   #29
badboy6120 is offline badboy6120  Malaysia
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Yes. (for better reliability use below 1K. otherwise unwanted oscillation will occur.)


even if it means lower frequency like 130khz???
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Old 3rd June 2019, 12:10 PM   #30
manojtm is offline manojtm  India
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Hi,
Quote:
for L use T157-2 core 1.5mm wire 49T (22uH)
Sorry typing mistake

T157-2 core 1.5mm wire 40T = 22uH
T157-2 core 1.5mm wire 49T = 33uH

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