These are my build notes for the nonlinear circuits "Tinkle" module.
Tinkle..... 4 channel preset drum module with a distortion circuit added on the summed output.
TINKLE & STOCHAOS 1
Links;
+ Wiki
+ BOM
I found the PCB you be very " tightly packed"... so use a soldering iron with a fine tip to avoid shorts.
The drums are based on the so called “Gamelan resonator” circuit developed by Paul DeMarinis in the early 70s for his Pygmy Gamelan device.
They are quite simple but have a lovely gentle tone and are easily tunable using different capacitors and gain resistors.
When building you can select capacitors to suit the pitches you want & different resistor values to vary the gain.
It would be good to build a few of these to have some variations in pitch
The distortion circuit is fairly harsh but when the drums are feed high frequency clocks you can get some quite heavy sync’d riffs going.
Each drum sound has an output. The 4 sounds are summed together and
passed through the Razor circuit for a mixed output. Turn the pot to
minimum or max to turn off the Razor and get a clean summed signal.
Parts
TL072 or TL082 4 Soic Tayda: A-1139
LL4148 6 sod-80 Tayda: A-1213
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The 5V1 zeners limit the output of Razors to +/-5V, they do not
have to be installed.... order
Mouser have a lot of 5V1 zeners in stock, some numbers are
78-BZT55C5V1-GS18 or 78-BZT55C5V1 or 78-TZMC5.1
Tayda have a sod-80 5V6 zener which is close enough - A-6014
I'm using a VISHAY TZM5232B-GS08 from Tayda (X-4504)
Zener Single Diode, 5.6 V, 500 mW, SOD-80 (MiniMELF), 2 Pins, 175 °C, Surface Mount
There are 2 x 33K resistor marked..... replace these with10K
.
When building you can select capacitors to suit the pitches you want,
also need to select a resistor value to vary the gain. Some suggested
values are listed below, but feel free to experiment.
Each Gamelan circuit uses 3 caps & 1 resistor.
There are 4 of these circuits.
For comparison, Andrew has also included a pic of a Twin-T & bridged-T circuit.
These 3 circuits are resistor-capacitor networks which are placed in the feedback loop of an op-amp.
Twin-T Oscillators (sometimes known as parallel-T oscillators) are RC (resistor-capacitor) oscillators which produce a sinewave output .
Andrew built a Twin-T (BongO) drum module many years ago which you might like to check out.
Bong0 - Bongo - Drum / VCO build notes
The Bridge-T oscillator is an even simpler form of RC network.
It's based on a bridge-T notched filter that is placed in the feedback loop of an op-amp,
changing it from a notch to a bandpass filter.
The Roland TR 808 bass drum circuit is based around a bridged-T network oscillator.
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All the capacitors in the build, should be the same value for each Cx and Rx sets
the gain for that section.
For example, use three 2n2 capacitors for the three C1 pads and solder
200k into R1.
Cx Rx
1n5 180k higher tone
2n2 200k
3n3 220k
4n7 220k
10n 200k
15n 390k
22n 510k
33n 680k lower tone
I think I'll mix things up
Gamelan 1 4n7 220k
Gamelan 2 10n 200k
Gamelan 3 22n 510k
Gamelan 4 33n 680k
It would be good to experiment with this values.
I reckon it would be fun to build a few of these
modules with other combos.
I prefer the higher frequencies.
Each drum sound has an output. The 4 sounds are summed together and
passed through the Razor circuit for a mixed output. Turn the pot to
minimum or max to turn off the Razor and get a clean summed signal.
The Razor is an unusual distortion circuit employing unbalanced comparators
to produce pulses that are mixed with the original signal.
The Razor can be used as a separate module. Patching a signal into the input
disconnects the summed Tinkle signal.
.
final caps 7 resistors.
S1JL, Schottky, power
rectifier or 10R
Im using a 10R resistor
LL4148
headers to connect the 2 PCBs, & eurorack 10 pin power connector.
10 sockets, 1 x B100k pot
Pair this with a VCA/EG
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You can find more NLC builds here.
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