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Open 7400 Competition / Re: [Entry] 8-Channel, 6 -MSPS USB logic analyzer!
thinking about opt-isolating all the signal inputs, any ideas ?
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Messages - helmy
thinking about opt-isolating all the signal inputs, any ideas ?
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Open 7400 Competition / Re: [Entry] 8-Channel, 6 -MSPS USB logic analyzer!
if its not clear how you would connect the PL2303 to this, all you need to do is connect the PL2303 RX pin the the SerOut and connect the PL2303 TX pin to the CLK
The U10 Pin 3 is connected to U1 pin 6
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Open 7400 Competition / [Entry] 8-Channel, 6 -MSPS USB logic analyzer!
I have a bunch of Prolific PL2303 USB-to-Serial port adapter laying around, this is a very popular IC and from testing it can go all the way up to about 6 MSPS even though the datasheet dose not say that !
what the circuit here dose is take 8 parallel inputs and outputs a valid TTL RS232 signal that can be fed directly to the PL2303 RX pin, all the circuit needs a clock signal with the same baud rate as set in the software , i thought about including a micro controller to generate a clock signal that can be controlled from the computer software, but that would add more non 74 ICs to this circuit !
anyway ,
after thinking about it i decided to use the PL2303 to generate the Clock signal too, and that it by constantly sending out a series of 0 and 1s out of the TX pin , and that is done by the computer software
the circuit diagram is attached to this post