Rectangular and triangular generator (CB21333E)

This circuit, based on a 555, was found in a Popular Electronics from the 90s. The circuit has the frequency determined by R1, R2 and C1.

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100 MHz Oscillator (CB6187E)
This 80's Motorola circuit can generate 100 MHz signals, but they can reach 200 MHz with the...
Rectangular Oscillator (CB15419E)
The oscillator shown in the figure generates a rectangular signal with a 50% active cycle (square)...
Preamplifier for Low Impedance Microphone II (CB936E)
This excellent 3-transistors audio preamplifier is suitable for use with low impedance...