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Hi<p>Can anybody help with the detail of 2 chips, one tx and the second and rx
chip. After my modulator (this consists of an op-amp and a few R's and C's)
i require a tx chip. We used this chip in a lab at uni but i can not
remeber this part no, or manufacture. Also i would like to know its
matching pair rx. This interfaces straight into a 4 pole butterwurth
demodulator. Requirements of tx and rx:<p>Transmission of up to 40 metres
pwr supply 5v dc<p>Thanks<p>Turbo

Hi,..<p> Check this link
http://www.linxtechnologies.com<p>search for " TXM-433-LC " or " TXM-315-LC "

I know of a company that sells small matched units.
Might be easier to start from scratch?

Here's another one:<p>http://www.bb-elec.com/<p>Click on the tech-notes tab