Explorer for all ranges (T1098E)

This circuit was found in a Radio Craft from October 1946. Power supply not shown, and tubes are 1.5V filament types.

ERB RD RE Series and RG Microcomputer Fuses
March 2017 - The new ERB-RD, ERB-RE and ERB-RG fuses from Panasonic's Micro Chip Fuses can now be...
Very Low Power C106 Alarm (CB24133E)
Using a 106 series SCR, this circuit was found in the May 1971 Radio Electronics magazine. The...
Touch Switch or Proximity Sensor (CB5061E)
This circuit is from an 80's documentation, making use of PUTs that are not currently common...