Easy to build (no internal adjustments required), nice sounding compressor
The pedal utilizes the TDA7052A 1W BTL audio amplifier chip with volume control as VCA and phase splitter for the side chain.
- Input Gain - use it to set the input gain according to the output signal of your intrument. Use lower settings for active electronics and humbuckers and higher gain for single coils. This knob controls also the compression threshold.
- Compression - sets the compression ratio. A yellow LED diode is used to show the amount of compression (kind of gain reduction meter...).
- Attack - controls the reaction time of the compressor. In practice, this knob controls the amount of transiets present in the compressed signal.
- Level - output volume control.
Power requirements: 9V DC, 25mA max
All design files, including schematic, PCB gerber filers, drill layout, BOM are in the linked below Github repository. Click "Download ZIP" to get all the files in one package.
PCB is designed to fit into a typical 1590B enclosure. I used Eddystone 27134PSLA box available at conrad.de.
I still have a few of these fabbed pcb, contact me if you are interested in getting one.
You can also etch one yourself. Here are the design files for the version I of the pedal (different drill layout!)
Demo videos / Sound Samples: