Digital Circuit Fundamentals 2 Unit 1 – Circuit Board Familiarization
The 555 timer CLOCK circuit generates a square waveform, useful as an input signal generator.
The PULSE GENERATOR circuit's toggle switch generates positive-and negative-going signal
edges. The "at home" position of this toggle switch is up.
The COUNTER circuit generates a 4-bit output with a count value between 0 and 15 (1111 in
binary form).
If MOD is enabled, the counter modulus is 10 (output between 0 and 9). You can free-run or step
the counter outputs (QD, QC, QB, and QA).
Placement of two-post connectors and interconnecting leads activates various circuit functions
and connects circuit blocks. Inserting a two-post connector in the BLOCK SELECT terminals,
for example, powers specific LED circuits.