Hi :)
I'm trying to make a simple IR transmitter and receiver circuit using the RX-B and the TX-2B chips. (http://www.elenota.pl/upload/TX-2B(RX-2B)AY.pdf on page 7) but I am unsure as to what the symbol with fosc=114Khz next to it means. It looks a bit like the symbol for a pot, and I'm assuming it has something to do with frequency? Any ideas?
Thanks :)
Yea that’s a potentiometer.
Yea that’s a potentiometer. Maybe if you set the resistance of the transmitter to be the same of that on the receiver data will be fine…but it’s just a guess.
At a second glance it looks like that pot sets the oscillating frequency for the resonator. On that datasheet pins 11 and 12 for the tx-2b are labbeled as oscillator pins.
I’d say: set both pots at same resistance value, that should ensure that transmission frequency is the same both for rx and tx.
**Its an adjustable resistor**<br><p>Its an adjustable resistor used in testing. If you look further down the datasheet you can see the recommended setup with fixed resistors.
**Thats a negative Capn,**<br><p>Thats a negative Capn, resistors must be 160k for transmitter and 250k for receiver.
Ok, Thanks for the help 
Ok, Thanks for the help
oopsie! You are right. As
oopsie! You are right. As usual 
Actually I’m still a bit
Actually I’m still a bit confused :L So do you think that I should connect a resonator in series with 160k resistor to pins 11 and 12 for transmitter and the same frequency resonator in series with 250k resistor to pins 4 and 5 for the receiver ? Is there any particular frequency resonator I should buy? Finally do I actually need a resonator for an IR circuit, I don’t remember ever seeing them before ?
Sorry if these are stupid questions or have obvious answers 
the circuit shows no
the circuit shows no resonator on those pins, so you should not get one. They prolly have a frequency generator inside them already.
