1 Bit ADC to DAC

280

03:26:22

555 - The Clock (too slow because of EC)
Up/Down - D-flip-flop style implmentation
Sine Source - Input signal
Output of the Up/Down is the "1 bit Digital data".
Low pass filter - Form the sine wave from the "1 bit digital data"
Opamp 1 - Buffer with AC pass
Opamp 2 - Voltage amplifier
Thats it. maybe current amp + speaker for testing purposes. 1 through 4 complete the ADC and 5 through 7 complete the DAC.

Yes i know it looks like crap on EC because the clock is too slow. A 50kHz or 100kHz clock would make a beautiful sine wave.

published 10 years ago

roops1967

10 years ago

You got me intrigued! How's this this work, what's the principle behind the ADC in step 4?

GingerKing

10 years ago

I dont know the exact answer to your question because its a little vague. PWM connected to a RC circuit results in an analog output with a small high frequency ripple. In step 4 the PWM is generated by the Up/Down counter. If you record this with a MCU, then you have the several"1 bit" samples of the input. Its just a PMW signal. Nothing special. The ADC relies on feedback from the counter because otherwise the input signal is either above the digital ~2.5v threshold or below.. which would give you just a square wave of the input. Mess around with the caps and the potentiometer next to the counter and you'll figure it out the functionality.

GingerKing

10 years ago

Figure out the functionality*

Addramyrz

10 years ago

Thats about all the info we were given for sex ed back in my day. "Mess around with the caps and the potentiometer next to the counter and you'll figure out the functionality".

roops1967

10 years ago

Thanks, interesting how it works

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