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You've reached the Lord of the Hertz information service...

Here's the plan: use this space to share some of my home-built musical devices, modifications to gear, electro-mechanical tinkerings and perhaps one or two other activities that I feel might fit in with the overall "scheme of things/general vibe" - like a photo or something.

With any luck, the information might be useful to others. That's the plan at least....

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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...
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Casiotone CT-310 external clock sync

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 rock solid sync - the resultant system can be prone to glitches unless buffered in some way, so making adjustments to tempo on the fly or switching other gear on and off, can cause things to go awry. 3. there are various  sync signal formats in use, (12 ,  24 or 48 ppqn being common), however, these do not apply to the Casiotones. With the mod below, they require multiplying ...
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Ganged Switch Wiring

Just an image to show how to wire ganged switches as an alternative to using a potentiometer with an Arduino, or similar. This allows the user to instantly jump to a desired setting/option with precision. Here are some ganged switches (the six blue buttons) to select patterns on a build of jan ostman's O2 Minipops drum machine: The dark grey button to the left selects between banks for a total of 12 patterns. Note: A simpler (but less speedy) option would be to use a rotary switch. As in the build below:
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