![](https://s3images.coroflot.com/user_files/individual_files/613050_va7qnvzwlpob3uxyqnugncxtj.jpg)
Advert for the original Steiner synth module. The unit employs it's own power supply, rather than using a power supply from a modular system.
![](https://s3images.coroflot.com/user_files/individual_files/original_613050_7_tIOF8u9vAdSwU8r3LHFCplx.jpg)
I've no idea why this power supply schematic based on the original, is +12v and -10v? I'll have to do my homework on this project.
View PDF
View PDF
![](https://s3images.coroflot.com/user_files/individual_files/613050_iwbl8bim54jq4sdeitjxblpah.jpg)
Ouch, 10 $ each for the two Vactrols.
![](https://s3images.coroflot.com/user_files/individual_files/613050_khp9pdpcki7uhpuecxcfphlxs.jpg)
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A very basic PCB trace that I made for stepping the voltage down from +-15v to +-12v. It's decoupled from the power supply and snaps between the power supply connector and the PCB power header. This should be interesting.
![](https://s3images.coroflot.com/user_files/individual_files/613050_psmfeh8ti8apsqnlusdugiroh.jpg)
Etched the PCB without any major issues. Yet, upon testing, I measure the voltage and get a +12v reading on the positive rail output. When I measure the negative rail, I get a reading of -14 volts. I didn't have a load attached to the converter pcb, so that might very well be the reason one of the regulators didn't work properly. Further inspection is pending.
![](https://s3images.coroflot.com/user_files/individual_files/613050_qeod45bndbgimh3qrvanztzzf.jpg)
Vreg side view. 15v input at left header, 12v output at bottom header.
![](https://s3images.coroflot.com/user_files/individual_files/613050_f_ysvjejqijrvndzsrcaw8jpc.jpg)
Vreg top view. After debugging the -12v rail of the voltage regulation pcb, I've determined that I was sent faulty parts. I'll have to be more careful about what I order from Asia, on Ebay. Sometimes I get a batch of parts that are consistently faulty. Anyhow, I'll solder in the replacement regulator when it arrives.
![](https://s3images.coroflot.com/user_files/individual_files/613050_eksvsgyvrtcwigoyft3ailtjw.jpg)
The voltage regulation board acts as a sort of go-between adapter. Indeed the -12v regulator I was using was faulty. I have soldered in the new one, and I now measure -12v.
![](https://s3images.coroflot.com/user_files/individual_files/613050_j_tgd4cyeg46tb8dtawavnubs.jpg)
Trimmer pots have arrived. 25k each. Still waiting on a shipment of capacitors and Photometers to arrive in the mail.
![](https://s3images.coroflot.com/user_files/individual_files/613050_djci7whzlcnlywjomlue_oqfc.png)
A MOTM panel face from which I can reference while planning my own. I have ordered a double 5U panel from Synthesizers.com that I will use.
![](https://s3images.coroflot.com/user_files/individual_files/613050_cp8ibdhvxoug0chqzpbzbjv6s.jpg)
Just waiting for an RF transistor to arrive so as to complete the components population of the pcb.
![](https://s3images.coroflot.com/user_files/individual_files/613050_c84htwqpstwz2fjoxgmtha24w.jpg)
There are two switching jacks and three non-switched jacks incorporated. There are 3 x 2m ohm linear pots and the rest of the pots are all linear 25k ohm. Lots of twisted pairs in this build. I've even got a nice blister on my thumb from all the wire work.
![](https://s3images.coroflot.com/user_files/individual_files/613050_uerxerffznvaqaofyvdresekp.jpg)
Most of the jacks and pots are soldered to their respective nodes now. I'm just waiting for 8 switches to arrive so that I can wrap this project up. The switches are of the spdt and dpdt variety.
![](https://s3images.coroflot.com/user_files/individual_files/613050_lgozpccfgoysov7wtjnbdxrwo.jpg)
In test. I can hear the filter working, but no oscillator just yet. I'll need to trace through the circuit with my scope to find out why I can't trigger the envelope to hear the oscillator. Yesterday, I could hear only the the oscillator and no filter, but today it's the opposite. I had made some changes to eliminate some of the switches and pots, so as to fit everything into the panel.
![](https://s3images.coroflot.com/user_files/individual_files/613050_qjbxloieqmsycrtxdsjt43s7z.jpg)
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