Ringmodulator single DC coupled


Ringmodulator single front view.

This is the 12V Euro single DC coupled version of my NGF dual version. It uses the now obsolete LM1496 balanced modulator -demodulator. But you can still source them and I have some in my stock. So I decided to make a PCB and module. I started with the original Elektor Formant schematic published in "Formant Erweiterungen" p35ff. I left out the microphone and envelope follower part because I already have such modules. I have added input buffers and raised the signal level to my 10Vpp used throughout my system.

Specs and features



Ringmodulator single schematic control board

Ringmodulator single schematic: Control board

Ringmodulator single schematic 01 main board

Ringmodulator single schematic: Main board


This implementation follows closely the original Elektor Formant implementation. Refer to the original documentation if needed. You can find it on the net. My changes are the input buffers and the adaption to my 10Vpp signal level.



  • You need to adjust the trimmers TR1 and TR2. They are used for canceling the input signal.
  • Adjust a sine signal to about 1000Hz and 10Vpp signal level.
  • Connect the signal to input ACA (ACB) and adjust TR1(TR2) such that the input signal can no longer be heard or seen (if you use a oscilloscope) at the output.

Building hints

  • None

Special parts

  • The LM1496 is obsolete now, but you can still source them. Beware of counterfeits.


Ringmodulator single control board documentation download
Ringmodulator single control board Gerber files download
Ringmodulator single main board documentation download
Ringmodulator single main board Gerber files download
Ringmodulator single *.fpd file

Ringmodulator single front view

Ringmodulator single: Front view

Ringmodulator single populated control PCB

Ringmodulator single: Populated control PCB

Ringmodulator single populated main PCB

Ringmodulator single: Populated main PCB

Ringmodulator single back view

Ringmodulator single: Back view

Ringmodulator single half front view

Ringmodulator single: Half front view

Ringmodulator single side view

Ringmodulator single: Side view

2022 May 110-A

2022 May 101-B

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