This interesting digital counter with relays with complementary outputs was found in the Radio Electronics magazine of October 1961. The supply voltage is in accordance with the relays used.
In the figure we give a suggestion of a high-power stage to excite a speaker with the 2N3055. The...
This guitar pedal was found in a 2004 documentation. The signal is transmitted to an FM receiver...
The circuit shown below is from the National Semiconductor's 1994 Linear Applications Handbook. The...