Frequency central
Build documentation for:
Pocket calculator
rev(2)
Main PCB Panel PCB
Bill of Materials
1K x 20
4K7 x 2
10K x 1
33K x 5
100K x 2
All resistors are ¼ watt
metal film
**
Momentary switch***:
or
* or
, but rotate by 180° for different pinout.
** yes 8 x 78L05. One is used as a 5V regulator, the other seven are used as output buffers.
*** you can use either type of switch, pads are provided for both. I prefer the Tactile type.