We started out with an old modem and ended up with a useful circuit to convert phone audio to regular line audio. This little hack is useful for those of us wanting to record Voip telephone calls for ...

Analog phones may be nearly obsolete today, but having served humanity for well over a century they’re quite likely to pop up in drawers or attics now and then. If you’ve got a few of them lying ...

At the heart of the control scheme of a classic switching regulator is the analog modulator, of which one typical implementation is shown in Figure 21. The analog modulator is essentially a comparator ...