Hills & Valleys (Peak & Trough)
DESCRIPTIONThis module is a variation on the 1973 Classic Serge Peak and Trough module. Both the Peak (Hills) and Trough (Valleys) operate in the range of 0V to half of the positive power rail, i.e. 6V on a 12 volt system, and 7.5 volts on a 15 volt system, though in practice, you may find the Trough (Valleys) section does respond to input voltages going a volt or two below 0V.
DETAILSDIY PCB
Current: TBD
PCB Size: 6” x 1”
Source text from Ken Stone’s CGS website
”The Peak (Hills) module is effectively a diode OR gate. An emitter follower (the lower transistor) is used to cancel out the voltage drop of the input diodes. The upper transistor is a constant current sink acting as a pull-up.
The Trough (Valleys) module is the reverse of the Peak, based around a diode AND gate, again with an emitter follower (upper transistor) compensating for the voltage drop across the input diodes, and a current source acting as a pull-down.”
An error was found on the current pcb on the Hills/Valleys circuit. R5 connects to the nodes between pin 2 of Q2 and Ground. The Ground side of R5 should actually connect to V-. See Photo
** 4U Modular is a term used for the format most commonly known as “Serge Format” or “Loudest Warning Format”. Out of respect for the ever growing format, 4U Modular is the easiest way to refer to it. More Specifically it refers to the panel height and mounting hole style. 4U Modular will patch up just fine with other 4U "Serge" formats such as "Random Source", but it will not mount in RS boats or Buchla Boats (or power off Buchla power for that matter). An info page about this will be added to the website soon to make this a lot more easy to understand.
DIY Info:
LGE084 Main Board Bill of Materials
LGE084 Main Board Schematic
LGE084 Main Board Designator Layout
Mechanical Parts BOM generally required for building Low-Gain Electronics Modules
Details:
PCB Size: 6” x 1”
Current Draw: TBD