Frequency central
Build documentation for:
Seismograf
Featuring code by Jetroid
Main PCB Control PCB
Seismograf is a PIC based drum module featuring coding by Jetroid. There is currently a
choice of two PICs which may be used with Seismograf, ‘BD‘ and ‘SD‘. As you might expect,
BD contains a range of 8 bass drums, while SD contains a range 8 of snare drums. The drum
sounds are 10 bit encodings of some of our favourite electronic kits from yesteryear. It is not
possible for the user to load their own sounds onto Seismograf PICs, but there is a chance
that we may release alternative drum sets as the years roll (!) by.
Key to PCB screen print:
n:
This signifies NPN BC547 transistors. Note the correct pinout as shown by the half circles.
The PCB shows the correct orientation for BC547. Other similar transistor types can be used,
but please observe the correct pinout.
Please observe the correct polarity of the diodes and electrolytic capacitors.
Reduce value for brighter LED
Diode clamping network to
protect CV inputs to the PIC
from over-voltage. CV Inputs
respond from 0V to 5V.
