MicroRing: Difference between revisions
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= Concept = | = Concept = | ||
The | Based on an idea by Uwe Schüler at HomeMade Camp 2013. The RingModulator is a XOR-Gate built from two NAND-Gates (IC2B and IC2C on the schematics). For the case of at least one Square-Wave on the two input lines, a XOR-operation on the two signals equals a mulitplication of the two signals. For this special case, our XOR stage performs a ring modulation. | ||
We can now feed two square waves to the two input lines of the XOR-stage. These are produced with one NAND-gate for each wave (IC2A and IC2D). The output of the NAND gate is fed back to one input over a potentiometer (R3, R5) and with a capacitor to ground (C1, C2). The other input is attached to VCC. | |||
This circuit only needs four NAND-Gates - exactly what a 4093 IC provides. Adding two potis, two capacitors, six resistors (all of the same size) and a diode is all this very simple circuit needs to produce a wide range of interesting sounds! | |||
= Parts = | = Parts = | ||
Revision as of 18:19, 17 November 2013
Concept
Based on an idea by Uwe Schüler at HomeMade Camp 2013. The RingModulator is a XOR-Gate built from two NAND-Gates (IC2B and IC2C on the schematics). For the case of at least one Square-Wave on the two input lines, a XOR-operation on the two signals equals a mulitplication of the two signals. For this special case, our XOR stage performs a ring modulation. We can now feed two square waves to the two input lines of the XOR-stage. These are produced with one NAND-gate for each wave (IC2A and IC2D). The output of the NAND gate is fed back to one input over a potentiometer (R3, R5) and with a capacitor to ground (C1, C2). The other input is attached to VCC. This circuit only needs four NAND-Gates - exactly what a 4093 IC provides. Adding two potis, two capacitors, six resistors (all of the same size) and a diode is all this very simple circuit needs to produce a wide range of interesting sounds!
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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