We found this circuit in an American publication from the 90s. It generates pulses that can be modulated in amplitude. The supply can be done by voltages from 5 to 12 V and the frequency depends on C1 and C2.
This long delay circuit was found in the July 1973 Radio Electronics magazine. The capacitor...
This basic circuit showing the LM3914 “inside” was published in the October 1980 issue of Radio...
Using only one general purpose transistor this circuit is powered by batteries. The lamp of the...