Buchla Power Supply Conventions

Buchla Power Supply conventions 

These PSUs changed over the decades so are confusing at times.
As I work my way through the modules that I own I'll update this post.
Please let me know if there are any errors.

Buchla 100
+15V, +24V, single ground.

Buchla 200 (early - Black Knob modules)
+15V, -15V, +/-24V, +5V, -5V, dual ground

Buchla 200 (late - "blue knob" modules)
+/-15 volts, +5 volts, +12 volts and 2 ground lines

Buchla 200e
Power on a Buchla 200e module is delivered from a  edac 306-010-500-102 connector.
The 200e cases come with a12 volt DC wallwart that connects to 3 DC-DC converters.
This is much safer & probably also helps in reducing background noise.

I've made some backup Buchla power supplies and the DC-DC converters  that I have successfully
used are:Cincon CHB75-12S05 (for the 5V),and two CHB75-12S15 for the +15/-15 lines.
CHB75-12S12 for the +12V.
If +24 is requited use a CHB75-12S24 DC/DC regulator. These codes are Mouser numbers.

1 Black - quiet ground
2 White: -15
3 Red: +15
4 Dark Green: +12
5 Orange: +5
6 Brown: noisy ground
7 polarizing key - no connection (use this to correctly orientate the EDAC.)
8 Yellow: i2c clock
9 Green: i2c data
10 no connection - (I often use this for supplying +24v)

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 This is the type of connector you will see on a 200 and 200e system

1 Black - quiet ground
2 White: -15
3 Red: +15
4 NC
5 NC
6 Brown: noisy ground
7 NC
8 NC
9 NC
10  +24v

There are quite a few PSU's out in the market at the moment.
Of course the official Buchla supply is the standard and if you use anything else you do so at your own risk.

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