This circuit was found in a Popular Electronics from the 90s. The circuit has 4 frequency ranges selected according to the capacitors. Signal is rectangular.
An stable multivibrator with 50% of duty cucle can be mounted using the 555 as shown by the...
This circuit uses a Norton operational amplifier to generate 1 kHz pulses with a 1 to 60...
This circuit, with a configuration like to many that we can find in this section, was suggested by a...