Discrete Transistor Ring Counter скачать в хорошем качестве

Discrete Transistor Ring Counter

Here's a little circuit that I've been messing about with recently on the workbench. It's a four-stage ring counter, made entirely out of discrete transistors (BC549 and BC214). The original circuit is by Alan Yates: http://www.vk2zay.net/article/201 This type of counter is a bit more complicated than others you may find, because it does not rely on capacitance to control its timing. It is entirely controlled by the square-wave clock signal that comes from an external source (my HP 3310A Function Generator in this case). This makes it easy to vary the frequency of the clock and hence vary the speed of the sequence. In the simpler designs, you'd need to vary four capacitors or four resistors all at once (for a four-stage ring). With this design, I can add a voltage-controlled low-frequency oscillator and control the speed of the counter by varying a single voltage. Then, I can add some relays to route other control voltages to drive an analog synthesiser.