Some of you may remember a recent project that featured on these pages, a 555 timer reproduced using vacuum tubes. Its creator [Usagi Electric] was left at loose ends while waiting for a fresh PCB ...

Sometimes it seems most comfortable to go with something familiar. Most every school uses a 741 op amp and many companies make an equivalent. Be aware that the design of the 741 was completed when ...

This is simple but powerful bass, treble, volume control is made by General Op-Amp IC LM741. The input voltage is 12V, but it will also work with 9V and 6V. This has inbuilt pre-amplifier also. Left ...