Thermostatic relay (CB21285E)

We found this circuit in an old QST magazine. The circuit is powered according to the thermostatic relay used.

Regulator with Low Adjustment Resistance (CB1205E)
In the figure we have a regulator circuit for output voltages of 0.5 to 10 V with currents up to...
Astable with waveform correction (CB25653E)
The diodes in this circuit are used for waveform correction. The circuit is from Electronics Now...
Switching amplifier (CB9001E)
We found this circuit in an old American documentation. The circuit applies to modern equivalent...