Identifying pinning on hybrid audio output IC
 

Before trying to find a/pair replacement for a
dual 50W power amp.
I know the + and - rails, inputs and outputs pins of the two amps
but can anyone suggest the fuction of the remaining pins ?
compensation,bypass etc.
A) via 150K to one side of the 53V ac secondary of the mains transformer.
B) connected via 47 ohm to a -15 rail
C) connected via 50V,10uF to this 47 ohm and then -15V rail
D) via 6V,33uF to ground

DC voltages at these pins
A) 0V
B) - 14.3
C) -13.2
D -4.3V


electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse

On Wed, 5 Jan 2005 20:21:06 -0000, "N Cook"
wrote:

Before trying to find a/pair replacement for a
dual 50W power amp.
I know the + and - rails, inputs and outputs pins of the two amps
but can anyone suggest the fuction of the remaining pins ?
compensation,bypass etc.
A) via 150K to one side of the 53V ac secondary of the mains transformer.
B) connected via 47 ohm to a -15 rail
C) connected via 50V,10uF to this 47 ohm and then -15V rail
D) via 6V,33uF to ground

DC voltages at these pins
A) 0V
B) - 14.3
C) -13.2
D -4.3V


electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse





What's the number on the IC? It's not usually that hard to find a
data sheet online.
Andy Cuffe

"Andy Cuffe" wrote in message
...
On Wed, 5 Jan 2005 20:21:06 -0000, "N Cook"
wrote:

Before trying to find a/pair replacement for a
dual 50W power amp.
I know the + and - rails, inputs and outputs pins of the two amps
but can anyone suggest the fuction of the remaining pins ?
compensation,bypass etc.
A) via 150K to one side of the 53V ac secondary of the mains transformer.
B) connected via 47 ohm to a -15 rail
C) connected via 50V,10uF to this 47 ohm and then -15V rail
D) via 6V,33uF to ground

DC voltages at these pins
A) 0V
B) - 14.3
C) -13.2
D -4.3V


electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse





What's the number on the IC? It's not usually that hard to find a
data sheet online.
Andy Cuffe


Actually a svi3102a . I have the service manual for the amp
but these 4 pins are not identified on the schematic.
A) is probably power on / off mute circuit
D) perhaps Bias

The SVI3102A is still an available part, from MCM & a number of other sources.

--
Stephen Sank, Owner & Ribbon Mic Restorer
Talking Dog Transducer Company
http://stephensank.com
5517 Carmelita Drive N.E.
Albuquerque, New Mexico [87111]
505-332-0336
Auth. Nakamichi & McIntosh servicer
Payments preferred through Paypal.com
"N Cook" wrote in message
...
"Andy Cuffe" wrote in message
...
On Wed, 5 Jan 2005 20:21:06 -0000, "N Cook"
wrote:

Before trying to find a/pair replacement for a
dual 50W power amp.
I know the + and - rails, inputs and outputs pins of the two amps
but can anyone suggest the fuction of the remaining pins ?
compensation,bypass etc.
A) via 150K to one side of the 53V ac secondary of the mains transformer.
B) connected via 47 ohm to a -15 rail
C) connected via 50V,10uF to this 47 ohm and then -15V rail
D) via 6V,33uF to ground

DC voltages at these pins
A) 0V
B) - 14.3
C) -13.2
D -4.3V


electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse





What's the number on the IC? It's not usually that hard to find a
data sheet online.
Andy Cuffe


Actually a svi3102a . I have the service manual for the amp
but these 4 pins are not identified on the schematic.
A) is probably power on / off mute circuit
D) perhaps Bias

"Stephen Sank" wrote in message
...
The SVI3102A is still an available part, from MCM & a number of other
sources.

--
Stephen Sank, Owner & Ribbon Mic Restorer
Talking Dog Transducer Company
http://stephensank.com
5517 Carmelita Drive N.E.
Albuquerque, New Mexico [87111]
505-332-0336
Auth. Nakamichi & McIntosh servicer
Payments preferred through Paypal.com
"N Cook" wrote in message
...
"Andy Cuffe" wrote in message
...
On Wed, 5 Jan 2005 20:21:06 -0000, "N Cook"
wrote:

Before trying to find a/pair replacement for a
dual 50W power amp.
I know the + and - rails, inputs and outputs pins of the two amps
but can anyone suggest the fuction of the remaining pins ?
compensation,bypass etc.
A) via 150K to one side of the 53V ac secondary of the mains
transformer.
B) connected via 47 ohm to a -15 rail
C) connected via 50V,10uF to this 47 ohm and then -15V rail
D) via 6V,33uF to ground

DC voltages at these pins
A) 0V
B) - 14.3
C) -13.2
D -4.3V


electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse





What's the number on the IC? It's not usually that hard to find a
data sheet online.
Andy Cuffe


Actually a svi3102a . I have the service manual for the amp
but these 4 pins are not identified on the schematic.
A) is probably power on / off mute circuit
D) perhaps Bias





In UK 40 GBP (80 USD) so yes and no.
I tend to try and replace with a couple of TDA7294V
at 6GBP each. without the internal power on/off muting.

On Thu, 6 Jan 2005 18:29:17 -0000, "N Cook"
put finger to keyboard and composed:

"Andy Cuffe" wrote in message
.. .

What's the number on the IC?

Actually a svi3102a .

FWIW, Google searches suggest that the SVI3102 is equivalent to an
RSN3502.


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

SVI3102B is 27.50 pounds at dalbani.co.uk.

--
Stephen Sank, Owner & Ribbon Mic Restorer
Talking Dog Transducer Company
http://stephensank.com
5517 Carmelita Drive N.E.
Albuquerque, New Mexico [87111]
505-332-0336
Auth. Nakamichi & McIntosh servicer
Payments preferred through Paypal.com
"Franc Zabkar" wrote in message
...
On Thu, 6 Jan 2005 18:29:17 -0000, "N Cook"
put finger to keyboard and composed:

"Andy Cuffe" wrote in message
.. .

What's the number on the IC?

Actually a svi3102a .

FWIW, Google searches suggest that the SVI3102 is equivalent to an
RSN3502.


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.