A current-feedback amplifier is a well-known component with many uses. Its basic block diagram shows that its input stage is a voltage follower—in practice, a symmetrical emitter follower (Figure 1).

We like a project that makes us think, and that was certainly the case with [MS-BOSS]’s octave downshifter that’s an entry in our current op-amp contest. Instead of resorting to an FFT,… ...

Posted in classic hacks, contests Tagged Op Amp Challenge, op-amp, phase shift oscillator, timer ← Retrotechtacular: Putting Pictures On The Wire In The 1930s ...

The heart of the circuit, shown in Figure 1, is situated around the three op amps at the top of the schematic. These op amps form a periodic analog staircase voltage, with six analog levels, ...

The op-amp mixer uses a square-wave LO to flip the polarity of the RF input. U1b, D1, D2, R1, and R2 form an inverting half-wave rectifier, which inverts the LO, and then outputs only the positive ...

The oscillator I built for the Cold Toe Detector to oscillate at 1.6 Hz was not optimized per se. I just grabbed the first low-power op amp that I could get, an LMC6041 (not the lowest-power one).

The op amp provides rail-to-rail I/O, which helps provide high dynamic range. The chopper architecture enables the device to achieve a high PSRR (power supply rejection ratio) of 135db and CMRR ...