This crystal oscillator is indicated for the calibration of IF steps of common radio receivers. The transistor admits equivalent as 2N2222 or BF494. The circuit is from an old American publication.
We found this circuit in 2005 Linear Technology documentation. The integrated circuit is LT1787...
This circuit counts from 1 to 10 or 0 to 9 using as indicators common LEDs. The circuit can be...
We found this circuit in a Popular Electronics of the 90s. The circuit still uses light bulbs, but...