circuit_breaker
- Sep 19, 2011
- 2
- Joined
- Sep 19, 2011
- Messages
- 2
here are two diagrams of what purports to be the same circuit - the first is floating around online of unkown (to me) origin - the second is taken from the web site of the manufacturers of the device on the left hand side of the diagram -
the output of the device is TTL level (i.e. between 0 & +5V) - but to connect to a pc it requires the circuit in the diagram - the trouble is, which one?
nb. simply connecting the device to a ttl<->usb converter doesn't work as the 100K pull up between pins 1 & 3 of the device is required to put the device into data sending mode -
I am pretty much a complete newbie to electronics - can anyone explain whether the signal should go to the non-inverting or the inverting input of the op amp? Or just any help with explanations of how the circuit is supposed to work would be greatly appreciated.
Cheers
Simon
the output of the device is TTL level (i.e. between 0 & +5V) - but to connect to a pc it requires the circuit in the diagram - the trouble is, which one?
nb. simply connecting the device to a ttl<->usb converter doesn't work as the 100K pull up between pins 1 & 3 of the device is required to put the device into data sending mode -
I am pretty much a complete newbie to electronics - can anyone explain whether the signal should go to the non-inverting or the inverting input of the op amp? Or just any help with explanations of how the circuit is supposed to work would be greatly appreciated.
Cheers
Simon
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