Sawtooth generator 555 (CB21229E)

This circuit was found in a Popular Electronics from the 90s. The frequency is given by R2 and C1.

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741 Semilog Amplifier (CB25831E)
This circuit with the 741 operational amplifier was found in the March 1995 issue of Electronics Now...
Divider by 10 (CB6898E)
This circuit was found in a General Electric documentation from 1966. It uses discrete components...
Operational Pulse Generator 1 (CB14830E)
We found this circuit in a French technical documentation from 1982. The circuit can be...