Reminder (CB9548E)

This circuit maintains on a flashing LED at a frequency determined by the capacitor. The unijunction transistor can be 2N2646.

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Frequency switch (CB8091E)
This circuit was found in a Popular Electronics documentation from the 90s. It is possible to switch...
Fuzz 5 (CB4875E)
This fuzz circuit is more elaborate with the previous ones, as it has a selection switch that...
Temperature to Pulse Width Converter (CB14376E)
The circuit presented is based on the National Semiconductor's LM3524, a component not common...