This can be considered a complete laboratory for the repair professional. A full featured signal tracer with 13 tubes. The circuit is from the March 1946 issue of Radio Craft.
August 2016 - It can be obtained from Mouser Electronics the new clock buffers HMC7043 of Analog...
The frequency of this circuit can be controlled by a voltage applied to the Vin input. The output...
Using JFETs, this circuit from a 90’s American documentation can generate signals of 0.15 Hz. The...