This traditional TTL configuration was obtained in a 1977 documentation. The supply must be made with 5 V and the capacitors can be changed for operation at other frequencies.
This simple timer is from a 1998 publication. Other operational amplifiers can be used, and the...
This very old circuit, from a publication from the 1970s, uses a germanium transistor and two...
This circuit generates signals for adjustments in FIs of 10.7 MHz. The transistors can be BC548 or...