As an alternative method of hitting my head against a brick wall, I'm trying to build from individual logic chips a circuit to use a keypad input, memory card store, then clock controlled output circuit to control a stepper motor.
Don't want to explain why just yet, as the results will be hilarious if it works, but the joke will fall flat if it doesn't !
The part that's holding my design of the circuit at the moment is how do I convert a binary number(currently only 4 bits, but might expand to 8) to a steady pulse stream, where the number of pulses will equal the value of the binary number, multiplied by a constant.
For example -
input 0101, output = 5 x 28 = 140 pulses
input 1011, output = 11x 28 = 308 pulses
where the constant = 28 in this example. (Once set up, the multiplier doesn't need to be changed.)
I thought it might need something like a DAC, but possibly not, possibly several chips to do it, but I'm having difficulty knowing what to call the process in order to search for the simplest answer.
John
Don't want to explain why just yet, as the results will be hilarious if it works, but the joke will fall flat if it doesn't !
The part that's holding my design of the circuit at the moment is how do I convert a binary number(currently only 4 bits, but might expand to 8) to a steady pulse stream, where the number of pulses will equal the value of the binary number, multiplied by a constant.
For example -
input 0101, output = 5 x 28 = 140 pulses
input 1011, output = 11x 28 = 308 pulses
where the constant = 28 in this example. (Once set up, the multiplier doesn't need to be changed.)
I thought it might need something like a DAC, but possibly not, possibly several chips to do it, but I'm having difficulty knowing what to call the process in order to search for the simplest answer.
John