Indicator with Magic Eye (T1322E)

This peephole test circuit was found in Radio Craft September 1948. The circuit is powered directly from the mains with a transformerless source.

Crystal Controlled Oscillator (CB6186E)
This circuit is from Signetics' 80s documentation. The circuit generates 100 kHz signals according...
VHF Transmitter (CB1564E )
The small transmitter shown in the figure can generate signals in the range of 50 MHz to 200 MHz....
1 kHz oscillator (CB6909E)
This oscillator produces a modulated signal using a unijunction transistor. We found it in an...