MicroNAND
Concept
The Idea is to generate two squarewaves with two NAND-Gatters of a 4093 IC and use the other two NAND as an XOR stage. The two waveforms are then send as inputs to the XOR and we have a Ring Modulation. Best of it, it's all on just one 4093. The additional parts are also very easy.
Parts
- 1* 4093 IC
- 6* Resistors with same value in kOhm range (I've used 2.2k in the prototype, because i've just had 5 at hand)
- 3* capacitors around 100nF (can also be 80, 120, 150, you don't have to use up all 100nF from the storage at any price ;-) )
- 2* Potentiometers in kOhm range (100k in the Prototype, also not critical)
- 1* Diode (just a normal one, doesn't matter much)
- 1* Battery Clip
- Battery
- Piezo Speaker or Jack connector or both
Schematics
The ingenious part of the schematics is the XOR made of two NAND (that's Uwe Schülers idea) over IC2C and IC2B and one Resistor to VCC on first NAND and another resistor to GND on the second NAND. The Schematics here are not yet showing the circuit as it should be for an XOR. So it is not a proper Ring-Modulation. A "correct" version will follow. But because of the nice sound of this circuit, the microRing will remain as it is. The other two NANDs just create rectangles that you can tune with the potis. The first Oscillator also triggers the second. You can attach a Piezo or a jack connector on the pins P$1 and P$3 on the right. As Vcc anything from 3 - 15 V should work. I've just tried 9V so far, though.
Board
So far, only a through hole board exists. But I'm working on the pseudo SMD variant (no more drilling!).
Mask (bottom): File:MicroRingBoardv02.pdf
Parts (top): File:MicroRingBoardPartsv02.pdf
Demo Video
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