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100W Ultimate Fidelity Amplifier
100W Ultimate Fidelity Amplifier
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Old 14th November 2019, 12:22 PM   #11871
karachay is offline karachay
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i left it open witouth signal it get warm..
i checkthi bias on 5w resistors its rising and when it warm now its 28,3mV
out voltage is -16,6mV

there is some thing i see if i open volume up (i cannot open now cause of my sister babies sleeping. quality of sound is broking bass going more soft and mids coming front side. i think why apexaudio make a tone preamp build behind amplifier.

sory for bad english and thank you soo much for your helps. i hope i can fix that 2 mistakes too. i will put pictures when i finish psu and put in chase all together.
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Old 14th November 2019, 12:32 PM   #11872
karachay is offline karachay
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.
edit double send same post

Last edited by karachay; 14th November 2019 at 12:34 PM.
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Old 15th November 2019, 12:10 AM   #11873
avtech23 is online now avtech23  Australia
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100W Ultimate Fidelity Amplifier
The bias should be set to around 25-30mA on the AX-14.

V = IxR = 0.03 x 0.33 = ~10mV across the 0.33R resistor.

30mV is giving you closer to 90mA bias which IMO is too much.

Also, DC at the output <50mV is usually fine.
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Old 15th November 2019, 04:35 AM   #11874
karachay is offline karachay
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Quote:
Originally Posted by avtech23 View Post
The bias should be set to around 25-30mA on the AX-14.

V = IxR = 0.03 x 0.33 = ~10mV across the 0.33R resistor.

30mV is giving you closer to 90mA bias which IMO is too much.

Also, DC at the output <50mV is usually fine.
ty for answer i will try 10mV to day
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Old Today, 11:00 PM   #11875
clpk is online now clpk  Brazil
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Hello, what changes should be made to use 45 0 45 VAC in this protection?
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