We found this time base of 0.1 to 90 seconds in a circuit manual from the 90s. The single-use transistors used are common and the frequencies given by the adjustment by the potentiometer.
In the figure we have the configuration of a transistor as a temperature sensor. The circuit is...
This blinker consists of a simple multivibrator and instead of the lamp, an LED and a 470 ohms...
The figure shows a Wien Bridge circuit with non-linear feedback. The resistance of the RL lamp is...