Metronome using operational (CB22060E)

We found this circuit in an English publication. The transistor can be BC549, and the power supply can be between 5 and 9 V.

Sinusoidal generator (CB21632E)
Found in Popular Electronics from March 1957, this circuit is based on transistors from the time....
3 A Voltage Follower L165 (CB15139E)
The voltage gain of this circuit found in the 1982 SGS Linear Integrated Circuits manual is 10...
Mobile Hole with the 4017 (CB12135E)
This circuit, found in an English publication in 1982, has an inverted sequential effect, as the...