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Old 1st March 2003, 09:25 AM   #11
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Join Date: Mar 2001
Location: Brazil
Default HV regulator

Quote:
Originally posted by audio_schef
To bad they don't make a cheap regulator and call it an LM317HV (higher voltage) or how about LM7860 for 60 volts and LM7960 for -60Volts.

They do make it.

It's the TL783. It goes from 1.25v to 125v, though limited to 700mA. It should be more than enough for low current stages.

The only catch is that you need 2 pairs of secondaries, completely separated, because you will have to do two positive regulators and join them later for the ground.

Pity I couldn't get any people that used it on this Forum to see how it works.



Carlos
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Old 28th April 2006, 12:47 AM   #12
bawang is offline bawang  Malaysia
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Join Date: Oct 2001
Location: Malaysia
SY, I have a cloned version of the TA800 MkII, built 6 yrs ago. Works, but overheated about 4 yrs ago. Revived it recently and discovered that the bias current (for both channels) will suddenly rise to 1.5A (from around 20-30mA) if I crank up the volume. It will stick at 1.5A until turned off and turned on again. This is the cause of the overheating.

Mine was built from a complete kit, except that I have changed the dual op-amps to LM833, with MJ15003/4 output. Using TL072 op-amps still cause the same overbias "sticking". Using back the NE4558 op-amps that came with the kit solved this problem...... Oscillation? When the bias current sticks at 1.5A, the outputs remain normal ie no high DC voltages etc. In fact, the amp still works normally with the bias stuck at 1.5A, even the built-in speaker protection circuit did not trip.

DC offset for this kit is a high, at around 150mV. Any thoughts? Thanks.
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Old 6th February 2013, 08:09 PM   #13
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Join Date: Feb 2013
Anyone have the TA-3600 User Manual, becoz I lost the Manual.......Many Thanks
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