This circuit is used in VHF and UHF superheterodyne receivers. The circuit is from the 1964 RCA transistors manual. Equivalent transistors such as the BF495 can be used.
A pulse goes off this horn produces 800 Hz tone when fired. Powered by 5 V the circuit works as a...
In the figure we have the way to excite a lamp up to 600 mA with one of the four operating LM324....
This frequency corresponds to musical note C3. Frequency accuracy depends on the accuracy of the...