We have made good progress in the last few weeks
Can I try and help others coming to this thread with a brief summary of where we are with the techie PSU
The early part of this thread covers the removal of the existing stock transformer and the various options with regulators.
In my book the only way to completely eliminate transformer vibration and stray magnetic fields from the transformer is to remove it.
To avoid further repetition I'll start from a situation where unregulated or regulated DC is fed into the techie.
Level 1 Build a good 21v regulator ( Reg 1) to supply the electronics. Remove the Techie regulator components. Fit this inside the Techie (the old transformer well is ideal.)
Level 2 Build a second identical 21v regulator (Reg 2). Cut one track on the main PCB and power the Control electronics from Reg1 and the Motor Drive electronics from Reg 2 . Again fit this inside the Tfr well
Level 3 Build a Sub regulator (Sub 1) to feed Q203 the FG Amp. Sub 1 is 9v and fed from Reg 1. I managed to mount this on the main PCB
Level 4 Build a Sub regulator (Sub 2) to feed IC 302 Pitch control on /off. Sub 2 is 5.6v and fed from Reg 1. I have my sub regs mounted on the two screws used by the original Techie regulator/heatsink.
At this point we are close to getting the Platter rotation as good as we can.
Level 5 Build a Sub regulator (Sub 3) to feed IC 301 Pitch control IC301 .Sub 3 is 9v and fed from Reg 1
Level 5 seems to me to be a bit of overkill as it is only active when Pitch Control is in use and I have never used PC when using my deck for Hi Fi
The Bare Bones system
If you do not want to use your TT in Pitch control mode
IC302 and IC301 and associated fader /switch are redundant.
They can be disabled or removed.
One links Pin 2 and 3 on IC201 to ensure normal operation.
We are all using different Regulators I/C's but achieving similar end results.
In my case
Reg1 and Reg2 are identical both set to 21v I used LM3081 regulators
Sub reg 1,2, 3 and 4 used LM3082 regulators.
These regulators are from the same family and the output voltage is set in theory by one resistor but in reality an additional multi turn trimpot is need to accurately set the voltage
Last edited by Ianmac; 28-01-2017 at 16:05.
Technics 1200 tweaked,Ianmac Bearing,DACT DIY Phono Pre, Belcanto CD-2, Engineered Switzerland DIY Renderer, Benchmark DAC2, Hypex NCore, ATC SCM40
2nd system --Engineered Switzerland DIY streamer, Sony CDP11,Topping D50 DAC, Hypex NCore. Kef 1point2 speakers. Ianmac Filters
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