Tubes

Articles
Title
One Tube Telegraphic Oscillator (T012E)
One Tube MW Receiver (T013E)
Tubes (T011E)
Grid Controlled Rectifier (T010E)
Modulated High-Frequency Oscillator (T009E)
Chatode-Coupled duo Triode Oscillator (T008E)
Experimental Audio Oscillator (T007E)
Staircase Generator (T006E)
Schmitt Trigger (T005E)
Electronic Switch (T004E)
High-Fidelity Audio Amplifier (T003E)
Spiral Time Base Generator (T003E)
Code Practice Oscillator (T002E)
Tubes – How they work (T001E)

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Simple 1-transistor oscillator (CB23615E)
This circuit takes advantage of the inductance of the coil of a high-impedance phone to form the...
Car Air Conditioner (CB15130E)
This circuit controls a fan in the car, according to the temperature, activating it automatically when the...
Telephone Spy II (CB18494E)
In relation to the previous circuit (CB18493E) this spy has an extra transistor, which can be a...