CGS124 is the CGS breadboard a module prototyping PCB.
Color legend (assuming +/-15 volts).
- Red: +15 volts
- Green: 0 volts/ground
- Pink: +5 volts. Note that pin 16 of the SO-16 is preconnected to the +5 bus.
- Orange: Free bus. Use it for clock signals or something else that you wish to distribute along the length of the PCB.
- Blue: -15 volts
The board can be used with either +/-12 volts or +/-15 volts, although the power connectors used are usually associated with +/15 volts.
On the rear of the PCB are various surface mount pads. These are to allow connection to the rails and IC pins under the SMT packages. There are also four pads associated with decoupling capacitors, allowing 1206 SMT decoupling capacitors to be used in these locations.
There are several power supply configurations possible with the board. Of note is the two variants of +5.
- If you have a power bus that uses the MOTM standard for +/-15/+5, you can install a six pin 0.156 header, three Ferrite beads and three 10uF decoupling capacitors.
- If you only have +/-12 volt or +/-15 volt power available, install a four pin 0.156 header, two Ferrite beads, two 10uF decoupling capacitors, two 100n capacitors and a 78M05 (or similar) regulator. Refer to the photographs for component positioning.
This is a guide only. Parts needed will vary with individual constructor's needs.
|Full module using 4 pin power|
|100nF (=0.1uF) Ceramic Monolithic||8|
|78M05 or sim.||1|
|MTA-156 connector 4 pin||1|
|MTA-156 header 4 pin||1|
|CGS124 VER1.0 PCB||1|
|PCB used with 6 pin power|
|100nF (=0.1uF) Ceramic Monolithic||6|
|MTA-156 connector 6 pin||1|
|MTA-156 header 6 pin||1|
|CGS124 VER1.0 PCB||1|
- 330R refers to 330 ohms. 100n = 0.1 uF, etc.
- The module will work on +/-12 volts or +/-15 volts.
- PCB dimensions are 6" x 2" (152.40 mm x 50.8 mm) with 3mm mounting holes 0.15" in from the edges.
Readers are permitted to construct these circuits for their own personal use only. Ken Stone retains all rights to his work.
- Breadboard / Prototyping board for music synthesizers. (archived) by Ken Stone, 2013, with permission of the author
- CGS Synth discussion group, for discussion of locating parts, modifications and corrections etc.
- CGS124 Breadboard/Prototyping Board, Elby Designs