38khz ir transmitter

[seesoe]

hello, im trying to create an ir transmitter based off a 555 timer, i have a few requirements of the circuit.

1. it must use only 1 3v coin battery
2. it must be simple and cheap as possible

here is a schematic i found as a starting point
**broken link removed**

my only issues are:
5v input, would a 555 cmos work with direct replacement?
frequency tuning, is it possible to make this without having to tune the circuit?

this is going to be in a product of mine, and i need it to be as cheap, simple, and effective as possible. long range is not an issue, the wireless gap is inside a pipe about 4 inches from where the receiver will be. all i need the circuit to do is pulse the ir diode when turned on.

if there is any other suggestions besides the 555 that would be great to know.

thanks everyone!

 

[ronv]

How about 2 coin cells? I think the Cmos 555 needs 1.5 volts and so does the IR diode. Not sure about the receiver.
Note: you need 2 555's to make the transmitter one for the 38Khz and another to turn it on and off so it doesn't think the IR signal is just from the lights.

 

[seesoe]

it will be hard to use 2 cells, there isn't to much room to work with.

i think i like the idea of a pic better, possibly a pic12fxxx family pic? any suggestions?

 

[ronv]

My bad one 3 volt coin cell not 1.3 volt coin cell. The 555's would do it or even a phototransistor since it is in a tube. Tell us more about what it does.

 

[seesoe]

its basically a relay selector, i have a circuit that detects infrared and every time it does it signals a CD4017 to count up thus activating corresponding relays
the tube is actually a hose with a handle, and i want one tactile switch on it, and when its pressed it will signal the receiver to change the relay.
the hose is 5/8 inside diameter, but there is a bottle neck at the connector of about 1/4 diameter. the receiver sits inside the body of a valve that the hose is connected to. so the wireless air gap is about the size of a 3"-4" long by 1/4" diameter cylinder.

 

[ronv]

As long as it's dark in the tube something this simple would work.