Ken Stone/1973 classic Serge/Serge peak and trough: Difference between revisions
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(Created page with "thumb|center|114px| The following info on the 1973 variant of the '''Peak and Trough''' module is presented for educational/histor...") |
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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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{| align="center" |
{| align="center" |
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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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