Found in EEE documentation, this circuit can have the duration and frequency adjusted separately. SCRs can be modern equivalent types.
The circuit shown is from the GE semiconductor manual of 1977. In the table we have the values of the...
This circuit for 3.3 V logic circuits has a 5 V input and the maximum output current is on the...
This circuit was found in a 1960s General Electric unijunction transistor manual. The circuit can...