MONO.HACKA. SEQUENCA. TRON/1 RESONANCE MOD

As my last monotron mod is very well undocumented, i will try to keep things organized this time.

The basis for the mods will be a monotron delay.
The reason for this, besides beeing by far the noisiest because of the cheap digital delay, the monotron delay has a lot of bonuses compared to the others.

POSITIVE

– switchable LFO waveform (rectangular or triangle)
– tunable LFO wave from slope-up to slope-down or PWM depending on LFO waveform
– delay, noisy or not its a delay

NEGATIVE

– no resonance/peak control (mod1)
– no LFO routing (mod2)

So the first mod will be to add a resonance control to it.

What you need beside very good soldering skills (we are going to tap an SMD resistor) and the usual soldering suspects, is a 10megs pot and some space in your monotron.

I solved the space problem by moving it into a bigger box:

20140608-121324-44004006.jpg

You need to tap the original circuit at three points, and connect that to a 10 megs pot.

The FIRST point is the hardest, so if you damage that, you can forget the whole project.
I thought its better to do it in first place, then fu** everything up at the end 🙂

20140608-121618-44178419.jpg

Make sure you dont overheat the circuit, dont melt anything and DONT use a regular 30watts iron.
You need a very fine tip and magnifying glass.

Connect this wire to the middle contact of your potentiometer.

The SECOND is easy, connect it to one of the free potentiometers contacts.

20140608-122012-44412558.jpg

The THIRD tap is easy too, its the audio-line when entering the volume control

20140608-122105-44465089.jpg

So what we basically did was feeding the audio back into the filter aka. resonance.

Next mod will be to feed the LFO tap-point into the filter FREQ tap-point, for filtermodulation.

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