Euphonic Adio iamp 350,2001

N

N_Cook

Guest
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
http://home.graffiti.net/diverse:graffiti.net/
 
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
http://home.graffiti.net/diverse:graffiti.net/
 
N_Cook wrote:
Just curious in passing, anyone know why there is a 555 in there, on the
pa/ps? delay-on or delay-off timer perhaps?
Click to expand...
Most likely a de-thumper.

--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------
 
Bob Larter <bobbylarter@gmail.com> wrote in message
news:hb6alf$sh6$2@blackhelicopter.databasix.com...
N_Cook wrote:
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.

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

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
http://home.graffiti.net/diverse:graffiti.net/
 
On 10/15/2009 12:37 AM N_Cook spake thus:

Bob Larter <bobbylarter@gmail.com> wrote in message
news:hb6alf$sh6$2@blackhelicopter.databasix.com...

N_Cook wrote:

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.

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


--
Found--the gene that causes belief in genetic determinism
 
N_Cook wrote:
Bob Larter <bobbylarter@gmail.com> wrote in message
news:hb6alf$sh6$2@blackhelicopter.databasix.com...
N_Cook wrote:
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.

It just seemed odd to see a 555 in there for just a hold-off timer function
Click to expand...
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
---^----^---------------------------------------------------------------
 
David Nebenzahl <nobody@but.us.chickens> wrote in message
news:4ad7569e$0$11312$822641b3@news.adtechcomputers.com...
On 10/15/2009 12:37 AM N_Cook spake thus:

Bob Larter <bobbylarter@gmail.com> wrote in message
news:hb6alf$sh6$2@blackhelicopter.databasix.com...

N_Cook wrote:

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.

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.


--
Found--the gene that causes belief in genetic determinism
Click to expand...

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
http://home.graffiti.net/diverse:graffiti.net/
 
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