CMOS Folder
Hello again
This is a distortion and wavefolding circuit built around the CD4069 IC. There are 6 gates on the chip, so its possible to build 3 of the folder/clipper circuits. These could be chained in series or used separately. One could also build a single folder and use the other gates of the IC for an oscillator. There is a quad opamp to make a mid reference voltage and to buffer the inputs of the folder for a low impedance signal to supply the circuit.
Basic idea here is like most folders as far as I know. A clipped and inverted signal is mixed with an unclipped and verted signal. The 4069 has a nice smooth clipping characteristic. By closing any one of the switches (S1-S3) the mixture of the signals changes so as to end up with only the clipped signal at the output.
Bill of Materials Revision 0
| Designators | Value | Qty | Link |
|---|---|---|---|
| BT1, BT2, BT3, BT4, BT5, BT6 | BT | 6 | Link |
| C1, C3, C5 | 105 | 3 | Link |
| C2, C4, C6 | 10uF | 3 | Link |
| R1, R2, R7, R11, R16, R19, R21, R28, R31 | 104 | 9 | Link |
| R3, R4, R14, R15, R24, R25, R26, R27 | 223 | 8 | Link |
| R5, R9, R10, R12, R13, R18, R22, R23, R30 | 473 | 9 | Link |
| R6, R17, R29 | 472 | 3 | Link |
| R8, R20, R32 | 102 | 3 | Link |
| RV1, RV2, RV3 | POT | 3 | Link |
| SW1, SW2, SW3 | SW_SPST | 3 | Link |
| U1 | CD4069 | 1 | Link |
| U3 | TL074 | 1 | Link |
send me an email if you build it! if you find some issues please let me know as well.
mill dot lorre at g mail dot com
Love,
-Will