Hi,
I bought an amp on ebay (Pioneer SA-700) and found that the input terminals were too close together for my leads, so it got me thinking about how I would fix it. I decided to installing a small USB sound card in the unit in the place of the DIN-5 port (cassette deck in/out).
I have modified the sound card to a type B USB port. The next thing was to remove the DIN port and wire up the sound card's audio in/out to the tape in/out ports. Removing the DIN port was a bit difficult due to space and so I ended up just hacking it out. Being a long time since I've done anything like this, I didnt think about the way the DIN was connected having any relevance to the rest of the unit. In my mind the DIN was just daughtered off the other tape deck ports (MON and REC). Now I have looked at the circuit diagram I am not so sure.
I have uploaded the diagram to a simple webpage to be found here https://sites.google.com/a/nathanbarton.com/www/, nothing fancy I'm afraid. There are also 3 photos of the area affected.
I have removed the DIN-5 port and the 6 resistors attached, wondering now whether removing the resistors was a bad idea, I thought it would be isolated and the resistors just related to the DIN operation, now I'm not so sure.
I did also blow a fuse last night, I dont know if I shorted something while testing, but may be related.
Any ideas on how to proceed? do I attempt to rebuild the circuit related to the DIN 5 port with the resistors? Is there an easier way? the unit is quite tight and hard to get in close, so I have used long green leads as a result so I can bring my work out of the box.
Unrelated, I am also upgrading the speaker ports to higher quality ones as I couldnt find the plug they used to use.
After all this is done and working, I am thinking about inserting a TOSLINK unit (Jaycar has kits available) and maybe even an ethernet media player... although I may just keep it outside the box due to heat loads.
many thanks
Nathan
site link https://sites.google.com/a/nathanbarton.com/www/
btw, love how the old amps include full documentation, they were obviously proud of their equipment back in the day!
I bought an amp on ebay (Pioneer SA-700) and found that the input terminals were too close together for my leads, so it got me thinking about how I would fix it. I decided to installing a small USB sound card in the unit in the place of the DIN-5 port (cassette deck in/out).
I have modified the sound card to a type B USB port. The next thing was to remove the DIN port and wire up the sound card's audio in/out to the tape in/out ports. Removing the DIN port was a bit difficult due to space and so I ended up just hacking it out. Being a long time since I've done anything like this, I didnt think about the way the DIN was connected having any relevance to the rest of the unit. In my mind the DIN was just daughtered off the other tape deck ports (MON and REC). Now I have looked at the circuit diagram I am not so sure.
I have uploaded the diagram to a simple webpage to be found here https://sites.google.com/a/nathanbarton.com/www/, nothing fancy I'm afraid. There are also 3 photos of the area affected.
I have removed the DIN-5 port and the 6 resistors attached, wondering now whether removing the resistors was a bad idea, I thought it would be isolated and the resistors just related to the DIN operation, now I'm not so sure.
I did also blow a fuse last night, I dont know if I shorted something while testing, but may be related.
Any ideas on how to proceed? do I attempt to rebuild the circuit related to the DIN 5 port with the resistors? Is there an easier way? the unit is quite tight and hard to get in close, so I have used long green leads as a result so I can bring my work out of the box.
Unrelated, I am also upgrading the speaker ports to higher quality ones as I couldnt find the plug they used to use.
After all this is done and working, I am thinking about inserting a TOSLINK unit (Jaycar has kits available) and maybe even an ethernet media player... although I may just keep it outside the box due to heat loads.
many thanks
Nathan
site link https://sites.google.com/a/nathanbarton.com/www/
btw, love how the old amps include full documentation, they were obviously proud of their equipment back in the day!