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Yamaha PS-30 : Solo Section Filter and De-tune Mods

Behind the Yamaha PS-30's "Solo" section, there's a simple monophonic analogue synth. Here's how I brought the filter and tuning controls to the front panel...Quite simple, it's involves removing 3 trimmer pots from the PCB and replacing them with regular potentiometers mounted on the front panel. First, however, much gratitude goes to the excellent Table Hooters site for the detailed information on this keyboard's inner workings: http://weltenschule.de/TableHooters/Yamaha_PS-30_PS-20.html (click images to enlarge) My Yamaha PS-30 - the green, blue and red knobs (top right) control de-tune, cut-off frequency and resonance respectively You can already access the solo section's tuning control via a removable plug on the back of the case: Removing this plug allows access to a trimmer pot on the PCB. I replaced this with a regular pot mounted on the front panel. Back of case removed... The solo section PCB is the shaded area on t...

Casiotone CT-310 external clock sync

UPDATE - May 2025 I've recently revisited this theme and found a more robust solution which has better stability in terms of timing. This involves using a photo coupler to isolate the external clock signal from the Casiotone's circuit. The approach shown below is still viable but I'll endeavour to post the updated method soon. ====================================== The older Casiotone keyboards with analogue circuitry can generally be modified to accept external clock signals for synchronising their rhythms to other equipment - but there are a few caveats: 1. there are various Casiotone 'families' based on different chipsets and implementations. This means there's no standard way to do this across all models and even models that share the same CPU might be programmed differently. For example, with an external clock signal, the CT-310 and the MT-65 sync at the same tempo while the MT-86 plays at half their speed. 2. the mod outlined below might not deliver a ...

School Rhythmer Peg Matrix

Here are some photos showing the construction of the peg matrix from my School Rhythmer drum machine project: Basically, it involves micro-switches, wires and diodes arranged in columns and rows, creating an 8 x 5 matrix The columns carry the trigger signals from the step sequencer - there are only eight steps - while the rows carry the trigger signals to each of the five drum sounds. When a peg is inserted, it closes the associated micro-switch so that the particular drum sound is triggered at that step. The diodes isolate each switch from the matrix. Without these, any trigger signal would dissipate throughout the whole matrix triggering every drum sound that has a peg inserted along its row, regardless of the current step. The rest is 'mechanical'. I used micro-switches as a cost effective solution. An alternative might be 3.5mm jack plugs and sockets, such as the switching type that make/break a circuit when a plug is inserted. A further idea would be to use tact switches w...

Lord of the Hertz

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