Ken Stone/1973 classic Serge/Serge peak and trough
The following info on the 1973 variant of the Peak and Trough module is presented for educational/historic purposes only and are not to scale.
How it works[edit | edit source]
Functionally it is remarkably simple. Diodes form the linear equivalent of an OR gate or an AND gate. There is a 0.6V voltage loss across the diodes. This is followed by a complementary emitter follower which loses 0.6 volts in the opposite direction, thus compensating for the loss in the diodes. A constant current source acts as a pull-up or pull-down for the emitter follower. The "no inputs" base state is derived from a resistor pull-up or pull down to an appropriate voltage rail, while using another diode to clamp it to either 6 volts (trough) or 0 volts (peak). FD6666 diodes were used, though any common silicon signal diode would do. Generic general purpose silicon signal transistors can be substituted.
Construction[edit | edit source]
 |
 |
 |
PCB connections
- A = Peak input
- C = Peak input
- B = Peak input
- D = Peak input
- E = Peak output
- F = Trough input
- G = Trough input
- H = Trough input
- I = Trough input
- J = Trough output
- W = 0v
- X = +12v
- Y = +6v
- Z = -12v
CC-BY-NC[edit | edit source]
Readers are permitted to construct these circuits for their own personal use only. Serge Tcherepnin retains all rights to his work.
See also[edit | edit source]
References[edit | edit source]
- Some info on the 1973 variant of the Peak and Trough module. by Ken Stone, 1999, with permission of the author - archived
External links[edit | edit source]
- Egres - The unofficial Serge web site
- CGS Synth discussion group, for discussion of locating parts, modifications and corrections etc.