Draw the circuit diagram of V-F and F-V converter using 555 timer and explain their working?

Question

Draw the circuit diagram of V-F and F-V converter using 555 timer and explain their working?

Answer 1

I'm not aware of any way to do that with a 555

LM331 is one possibliby for V-F

http://pdf1.alldatasheet.com/datasheet-p...

LM2917 is one possibliby for F-V

http://www.national.com/mpf/LM/LM2917.ht...

Answer 2

V-F:

Configure the 555 in astable mode. By applying a voltage to pin 5 you can vary the frequency (on pin 3) independently of the RC network on pins 6 and 7. The voltage can be varied from 45% to 90% of Vcc.

F-V:

Configure the 555 in monostable mode. The 555 puts out a fixed time-width pulse determined by the R and C on pins 6 and 7. Convert the input frequency to a short pulse using a differentiator (series capacitor OK, with a diode connected to Vcc to prevent the input to the 555 exceeding Vcc). This signal is connected to the 555 on pins 2 and 4 and triggers the monostable. The output (pin 3) is then filtered to a steady voltage.