This circuit makes use of a transconductance operational amplifier from the 90s. Formula for the calculation of the components is given next to the diagram.
This circuit was obtained from an English magazine from 1976. The circuit operates two LEDs and...
Found in a publication from the 60's, this power supply has no regulation, but only current...
This circuit can use the LM148 and its more modern equivalents, generating a sinusoidal signal whose...