R1 may be 10k and R2 100k. The transistor can be the BC548 and instead of the small lamp we can use a series LED with a 1k resistor. D1 is germanium and C1 is 10 nF. C2 can be 47 nF.
This circuit was found in the power semiconductor manual of the 1980s ON Semiconductor. The...
This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time...
August 2016 – It can be obtained from Mouser Electronics the new modules Littelfuse for surge...