This circuit that generates a special sound was found in a Popular Electronics from the 90s. The base is the 555 and the transistors admit equivalents, and a power stage can be added.
The operating range of this circuit is 10 kHz 30 MHz. Equivalent transistors can be used. The...
We found this circuit in an old documentation. The operational amplifier of the time can be...
Found in 1969 RCA documentation, this dimmer uses a dual time constant setting to achieve better...