To drive a MOSFET requires more than merely a logic level output, there’s a requirement to charge the device’s gate which necessitates a suitable buffer amplifier. A variety of different approaches ...

The popular 555 timer can be used as a PWM/Class-D amplifier for musical instruments or other applications. It can use a wide supply range of 4.5-16V and produce 200mA of drive. The audio is fed to ...

This article is part of the Ideas for Design Series: Vol. 3, No. 1 The original bipolar 555 timer, the NE555, is excellent for driving a power MOSFET’s gate. Newer CMOS versions such as the 7555, ...

This simple LED driver circuit allows us to drive up to seven LEDs by using a single NiMH (Nickel Metal Hydride) AA cell. The circuit produces voltage pulses at a much higher level than the input ...

“Good, fast, cheap: choose two.” That engineering maxim is almost as prevalent as “if you can’t fix it, feature it.” That’s why I’m quite happy to have an idea that might achieve all three of those ...