This circuit is from the 1992 Radio Electronics Handbook. The components used are from the period, with emphasis on the 2-digit display driver.
This circuit generates low-frequency sinusoidal signals. The variable capacitor is dual and the...
These circuits were obtained in an Electronics Now from the 90s. The integrated circuits are from...
This circuit for voltages up to about 20 V was found in a 90s Popular Electronics. The LED can be...