I am asuming no one came up with a schematic. All parts can be obtained from www.web-tronics.com
You can replace D1 with what ever voltage you need up to 11V to allow
head room for the NPN transistor to function, And you can replace D1
with a 10K resistor or if you just need +11 or +12 COS depending on
the incoming voltage, and you can also put a 5 or 10K potentiometer in
place of R2 and D1 to have a variable COS voltage.
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