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Euphonic Adio iamp 350,2001

N

N_Cook

Jan 1, 1970
0
Just curious in passing, anyone know why there is a 555 in there, on the
pa/ps? delay-on or delay-off timer perhaps?
 
N

N_Cook

Jan 1, 1970
0
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.
 
B

Bob Larter

Jan 1, 1970
0
N_Cook said:
Just curious in passing, anyone know why there is a 555 in there, on the
pa/ps? delay-on or delay-off timer perhaps?

Most likely a de-thumper.
 
N

N_Cook

Jan 1, 1970
0
Bob Larter said:
Most likely a de-thumper.

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


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

David Nebenzahl

Jan 1, 1970
0
It just seemed odd to see a 555 in there for just a hold-off timer function

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.
 
B

Bob Larter

Jan 1, 1970
0
It just seemed odd to see a 555 in there for just a hold-off timer function

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

N_Cook

Jan 1, 1970
0
David Nebenzahl said:
function

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.


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
 
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