This circuit of a 1969 Electronic Design uses RTL logic. The setting can be adapted to TTL. The frequency is given by the crystal.
In the figure we have the basic configuration of an inverter transconductance amplifier, as...
We found this configuration in a 1974 technical documentation. The circuit consists of a filter to...
Intervals of more than 39 hours can be obtained with this programmed circuit that we found in a...