Ken Stone/1973 classic Serge/Serge peak and trough: Difference between revisions
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== How it works == |
== How it works == |
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[[File:cgs_serge_schem_serge_r3.gif|thumb|center| |
[[File:cgs_serge_schem_serge_r3.gif|thumb|center|431px|]] |
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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. |
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. |
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== Construction == |
== Construction == |
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| [[File:cgs_serge_peak_and_trough_pcb1.jpg|thumb|center| |
| [[File:cgs_serge_peak_and_trough_pcb1.jpg|thumb|center|101px|PCB pattern]]||[[File:cgs_serge_peak_and_trough_pcb2.jpg|thumb|center|101px|PCB pattern and components]]||[[File:cgs_serge_peak_and_trough_pcb.jpg|thumb|center|102px|PCB component side]] |
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Revision as of 22:22, 11 June 2019
![](http://static.miraheze.org/sdiywikiwiki/e/e6/Cgs_serge_peak_and_trough_panel.jpg)
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
![](http://static.miraheze.org/sdiywikiwiki/4/44/Cgs_serge_schem_serge_r3.gif)
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
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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
Readers are permitted to construct these circuits for their own personal use only. Serge Tcherepnin retains all rights to his work.
See also
References
- Some info on the 1973 variant of the Peak and Trough module. (archived) by Ken Stone, 1999, with permission of the author
External links
- Egres - The unofficial Serge web site
- CGS Synth discussion group, for discussion of locating parts, modifications and corrections etc.