Euphonic Adio iamp 350,2001

Just curious in passing, anyone know why there is a 555 in there, on the pa/ps? delay-on or delay-off timer perhaps?

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N_Cook
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Presumably a stock fault with these Euphonic Audio, USA amps. I'm having to replace all 8 of the 1/4 inch jack sockets. 4 of the 8 are totally breaking up inside. Assembly flaw - they used unreinforced plastic spacer rings on the bush inside the chassis, not dense fibre washers. The ring breaks and the bits drop away and owner tightens up the front nut, not realising that without the spacer then the socket is skewed/levered against the pcb and rear of front panel and the socket housing starts cracking up. Otherwise sturdy but now detrimental soldering of the pins does not allow any give there. The pins are joggle-formed to tightly fit double-belled eyelets and soldered through the board so as solid as can be, with base of socket tight to the pcb.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N_Cook

Most likely a de-thumper.

-- W . | ,. w , "Some people are alive only because \\|/ \\|/ it is illegal to kill them." Perna condita delenda est

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Reply to
Bob Larter

It just seemed odd to see a 555 in there for just a hold-off timer function

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N_Cook

On 10/15/2009 12:37 AM N_Cook spake thus:

That does seem odd: one would think that a much simpler mechanism, either a capacitive delay or a relay connected to the power supply rail would actually be a better choice.

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Found--the gene that causes belief in genetic determinism
Reply to
David Nebenzahl

It'd be a nicer way to do it than other methods I've seen.

--
    W
  . | ,. w ,   "Some people are alive only because
   \\|/  \\|/     it is illegal to kill them."    Perna condita delenda est
---^----^---------------------------------------------------------------
Reply to
Bob Larter

the

function

You need the same Ct/Rt values in both cases and one does not use a 555

The other pig with this amp , it uses that grey ribbon with soldered stranded wire cores that can only take a limited number of bends/unbends at the terminations before cracking

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N_Cook

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