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Old 28th August 2010, 03:57 AM   #1
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Default Hifonics zues series 1 power supply

I have a Hifonics zues that has been in storage foe 15 years. An original Zues with the orange lettering before the roman numerals started (3 digit SN). The power supply whines, the frequency is low enough to hear (from the amp not speakers). I can adjust the power supply on the board to silence the sound at idle, but when a small 20k signal is applied it comes back and then it will disapeer at higher signal levels. Does anyone know the recommend procedure for adjusting the power supply. I am a die hard Hifonics fan and want to keep this dinosaur alive.
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Old 28th August 2010, 06:41 AM   #2
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Default Zeus III

This supply used TIP35s as the switching devices and so the switching frequency is about 25KHz.

Check the compensation between pins 2-3 of the TL494, There should be a series R-C combination. Check that the capacitor is OK

Add a resistor of about 22K between pins 2-3.

Try a snubber from TIP35 collector to collector maybe 4.7R 5w in series with a 0.047mfd 250v capacitor.

Since I designed this amplifier almost 26 years ago I do not have schematics any longer.

Regards


Steve Mantz
Zed Audio
Zed Audio Corporation
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Old 28th August 2010, 12:41 PM   #3
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Steve,
In the mid 80's, I had a Zeus in my custom VW Bug with two 15" Eminence subs. I won several audio events and suffered long term hearing loss....I just want to say THANKS!! Those were the days.
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Old 29th August 2010, 01:10 AM   #4
MOER is offline MOER  United States
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Default Zeus

Have you seen our new amplifiers?
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Old 29th August 2010, 03:19 AM   #5
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Yes, very nice. Do you have home amps as well?
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Old 30th August 2010, 02:41 AM   #6
MOER is offline MOER  United States
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Default Zeus

Yes we are busy on a 250w/ch home amplifier with switchmode supply and power factor correction.
It is being built for an OEM customer and will come to market in about 90 days.
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Old 22nd November 2010, 12:11 AM   #7
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Thanks for the help on my amp Steve. Keep us updated on when the home amp hits market.
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