This is my take on the Steiner Parker filter. It is based an article in Electronic Design 25, December 6. 1974. You can find various implementations on the net. Very interesting are those from YuSynth and Ken Stone. You can still find them on the web as well as the original article. With my input stage it is possible to use the three filter inputs LP, HP, BP in parallel. The LP input is normalized to the others, so only one patch cable is needed. All inputs have attenuator.
Specs and features
- Low pass, high pass, band pass input with attenuator
- Positive and negative ENV control with sign changer
- CV inputs for linear TM, log TM, envelope, V/Oct tracking and emphasis
- Runs on +/-12V and +/-15V (with minor resistor value changes for best performance)
- Power consumption below 20mA each rail