Serge Equal Power Panner
for music synthesizers.
The Serge Equal Power Panner is a sub-module used in some of Serge's designs, such as stereo mixers and panners. It is essentially a small, purpose made analogue converter that converts and sums control voltages in such a way as when coupled with the exponential response of the cgs102v10 gain cells, you can achieve voltage control of signal level and equal powered panning.
Quoted from the mixer section of the 1982 Serge catalog:
EQUAL-POWER CONTROL OF PANNING AND CROSS-FADING
Note that this sub-module processes control voltages only. No audio signal is handled by it directly. It requires CGS108 gain cells to function.
The circuit has been split over two PCBs, one containing the converter, the other the DC mixers.
Before you start assembly, check the board for etching faults. Look for any shorts between tracks, or open circuits due to over etching. Take this opportunity to sand the edges of the board if needed, removing any splinters or rough edges.
When you are happy with the printed circuit board, construction can proceed as normal, starting with the resistors first, followed by the IC sockets if used, then moving onto the taller components.
Take particular care with the orientation of the polarized components, such as electrolytics, diodes, transistors and ICs.
When inserting the ICs in their sockets, take care not to accidentally bend any of the pins under the chip. Also, make sure the notch on the chip is aligned with the notch marked on the PCB overlay.
To install the header, slide the pins partially out of the plastic carrier strip so that you can solder the pins as close to the PCB as possible. (Some headers will not need the pins moved.) Before soldering, trim the portion of the pins that go through the PCB so they are just long enough to reach the other side. Once the header is soldered to the PCB, the carrier strip can be carefully clipped off as it is no longer required.
There is no manual wiring on this module. All connections are made when the PCBs are soldered to the host PCB.
No set up is required.
This is a guide only. Parts needed will vary with individual constructor's needs.
Article, art & design copyright by Ken Stone