Apart from U2’s change from a 74HC74 to a CD/HEF4013B, the main difference is in U1. With a 12 V rail, TL062/072/082s and even LM358s and MC1458s all worked well, as did an LM393 comparator with an ...

Mechanical switches are pretty easy to understand—the contacts touch, the current flows, and Bob is, presumably, your uncle. But what about soft switches? Well, they’re not that difficult to … ...

Glitches are terrible things for circuit operation. Among other things, they are hard to see on an oscilloscope, and you may not know they are present. They can give subsequent clocks pulses in ...

O traço verde é o clock de entrada a partir de um gerador de função, o traço vermelho é a saída, local onde aparece o GLITCH. Os outros dois traços (lilás e azul) referem-se a entrada D e saída Q do ...

In this Idea for Design, a PIC16F886 is used to perform six different instrument functions, ranging from a voltmeter to a frequency counter.

-another 74HC74 -featuring a code-injection protection circuit (!): Having all the address, data, IO and control signals easy to access, all the firmware in UV EPROM, all the units physically ...

The 74HC74 has two totally independent flip-flops, but the larger parts usually don’t have the !Q outputs and often have combined clocks. For example, TI’s SN74HC173 Quad TS D FF has one clock and one ...

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If you do not need 1200 baud, this is not a problem. However, seeing that 1200 baud is used in practice more often than 600 baud, we have put a divide-by-two stage in the circuit after the 4060, in ...

[TBJ] is building what he calls a junkbox 3D printer. You can probably guess that he’s trying to salvage most of the parts for the device, and after pulling a stepper motor from an old printe… ...