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.
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This circuit was obtained from a Linear Technology manual from the 1990s. The components may have...
This configuration was found in old documentation and is valid for most general purpose NPN...