I am in a process of restoring this Yamaha TT and thinking about moving PSU and most importantly the transformer outside of the deck. I've done it in the SL-1200 according to the thread here and I liked the result.
Any suggestions recommendation on what would be the best way to do it here? The schematics is attached. I am planing on using two LM-based regulators, but have some concerns about the second tap, if I get enough regulated voltage...
Would appreciate any suggestions.
Any suggestions recommendation on what would be the best way to do it here? The schematics is attached. I am planing on using two LM-based regulators, but have some concerns about the second tap, if I get enough regulated voltage...
Would appreciate any suggestions.
Attachments
If discrete regulators are still working fine, I'd put only the transformer out of the case together with a diode bridge (if 1N4007 are OK for Wayne, the are OK for me) and a CRC cell, remove D101 bridge and C102 snubber, put two jumpers on ID481 holes and connect 29V to AA.
For the other tap (white/white) I'd put on external PSU D103 and C107 (together with a 470 to 1000uF), make a jumper in their place and connect 7V line to BB.
As 6L6 wrote for SL1200, you'll have the main benefit by putting away from the deck all the AC, so I think a simpler approach would be enough.
For the other tap (white/white) I'd put on external PSU D103 and C107 (together with a 470 to 1000uF), make a jumper in their place and connect 7V line to BB.
As 6L6 wrote for SL1200, you'll have the main benefit by putting away from the deck all the AC, so I think a simpler approach would be enough.
Now there is a question how to organize switching procedure. It used to be one switch that cuts the transformer primary. Now I will need to cut two DC coming from the external supply.
What about this:
1. I will use the higher voltage DC and will be switching it with the existing switch.
2. Tap 12V from this 29VDC and wire it to a relay to switch the second DC circuit?
Maybe something as simple as this:
https://www.amazon.com/HiLetgo-Channel-Isolation-Support-Trigger/dp/B00LW15D1M/
Or should I jus get bigger transformer set up this 29VDC and just down regulate this 7V from it with a simple LM regulator?
What about this:
1. I will use the higher voltage DC and will be switching it with the existing switch.
2. Tap 12V from this 29VDC and wire it to a relay to switch the second DC circuit?
Maybe something as simple as this:
https://www.amazon.com/HiLetgo-Channel-Isolation-Support-Trigger/dp/B00LW15D1M/
Or should I jus get bigger transformer set up this 29VDC and just down regulate this 7V from it with a simple LM regulator?
"Simplify, simplify"
Putting the original transformer in a external box and a new switch on primary and abolish the internal switching is easier
would like to preserve original functionality as much as possible.
