Hi all,
I'm new to these forums but I have a problem that is stumping me.
I have a circuit with 0 and 5 volt rails and a periodic input in the 400 Hz range with amplitude of +/- 1 Volt to 200mV.
I was thinking of using an optocoupler 814 as a buffer to avoid negatively biasing my 5 volt logic circuit. From the spec sheets for the 814 I found the following circuit to adapt AC signals to a TTL circuit. However, I'm measuring a square wave output of the attached circuit with peak voltage of 2.6V and low of -2.4V. The square wave distortion is not a problem since the frequency is preserved. I'm desiring a square wave from 0 - 5 Volts.
am I not measuring the output correctly or is the voltage still swinging negative. Can anyone point me in the right direction?
thanks in advance,
Kliff
I'm new to these forums but I have a problem that is stumping me.
I have a circuit with 0 and 5 volt rails and a periodic input in the 400 Hz range with amplitude of +/- 1 Volt to 200mV.
I was thinking of using an optocoupler 814 as a buffer to avoid negatively biasing my 5 volt logic circuit. From the spec sheets for the 814 I found the following circuit to adapt AC signals to a TTL circuit. However, I'm measuring a square wave output of the attached circuit with peak voltage of 2.6V and low of -2.4V. The square wave distortion is not a problem since the frequency is preserved. I'm desiring a square wave from 0 - 5 Volts.
am I not measuring the output correctly or is the voltage still swinging negative. Can anyone point me in the right direction?
thanks in advance,
Kliff