Suggested by a 1965 Electronic Design, this circuit was originally proposed for oscilloscope operation, but can be used with other instrument types.
This circuit produces a tone by a small loudspeaker. Frequency depends on C1 and C2. These...
We found this circuit in an 80's EDN. The circuit makes use of a MAX680, being given a table with...
Decade counters, such as the 4017, can be cascaded as sourcing signals with the frequency divided...