[sdiy] Roland System-500 Filter pcbs
fanwander at mnet-online.de
Fri Jul 30 18:41:25 CEST 2021
Inspired by the Alex Ball Video mentioned over at analogue heaven I
wanted to update my page about roland filters with the information on
the System 500.
I checked th thomann.de <http://thomann.de> pages for the pictures of
the module and got a little worried
This is the pcb of the 510 (should be one four stage OTA filter and a VCA)
This is the pcb of the 521 (should be two four state OTA filters)
This is the pcb of the 505 (it should be a tranistor ladder filter)
The pcb of the 505 is full of LM37000, while there is no OTA in the
The pcbs of the 510 and 521 show not a single OTA, but many parts which
seem to be double transistors - which I would expect for the 505.
After a first comparison of the 510 and 505 I thought Thomann mismatched
the pictures, but the 521-pcb looks too similar to the 501-pcb
Can you identify what are 6 pin parts on the pcbs for the 521/510?
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