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no im not using it to drive an led for a camera. im creating an ir emitter and receiver circuit. im using my camera to see how bright the ir emitter is because i cannot measure the current through it. another weird thing i found is that with my current set up the ir emitter led only works when...
hi, i realised the mistake, and i corrected it, the output voltage is now 1V Vpp but i dont think the current this time is high enough, because when i use my camera to see how bright the led is, its barely lit. I used Vcc as 9V as suggested as well. My setup now has no load resistance. When I...
ok thanks. i tried increasing vcc to 7V but the output signal pulses get distorted, what ever value i change the potentiometer to, the frequency would not change at all.. so i think the circuit is optimised for 5 V. are u suggesting that i shud use a buffer for the output of the IC? or to...
thank you for all your replies again. i shall double check my circuit and find the fault in it. i will update this post once i've found a fault. thanks again to goldsmith, keith and mister_rf. should i just rebuild the same circuit that i posted on here or any of you guys have a suggestion for a...
thanks for your reply goldsmith, is it ok if u can give a website or post an example schematic of a totem pole transistor configuration? it seems that there is not a lot on google. i might keep the supply voltage to 5V i think for convinience and the 555 timer is powered by 5 volts anyway...
hi, thanks vcc is at 5 volts and my circuit is the same except that i didnt use a button to the output. can you please elaborate what a totem pole would do? thanks for the reply.
how would you amplify the output signal of a 555 timer without distorting the signal? i tried using a bc547 transistor and the output voltage is increased from 150 mV to approximately 700 mV. I want the output to be around 2-3V. Also the amplified output signal from the transistor became...
ok, can you elaborate on that?? atm, i connected the ir sensor to an amplifier and then the output from the amplifier is connected to the lm567 chip for demodulation. I used the setup similar to this website : IR Remote Control - Electronic Projects - www.wimb.net i created the lm567 circuit...
Hi, Can any of you guys help me create a circuit for an infrared reciever that is demodulated at a specific frequency say at 38 kHz? I want to create an IR sensor that is similar to the pre-made 3-pin sensors available today like: **broken link removed**. I am not using the pre-made ones because...
cool thanks, atm I cannot seem to download the demo because I am at uni, is it ok for you to change the input voltage range from 3.5V to 5V and the output from 0V to 5V? and post the schematic here? thanks in advance.. sorry for being a pin and sorry i didnt know there is a help button here.. :S
thanks sir, I shall try it, may i ask what sort of program/software/webiste did u use to create the schematic u just shown me?? i would also like to to try it for the other setup: 3V to 5V converted to 0V to 5V. thank you very much for your assistance
Thanks for reply mister_rf, I don't think youve posted the example correctly is it ok if u can post it again so I can look at it? thanks again
---------- Post added at 13:04 ---------- Previous post was at 12:52 ----------
Thanks for reply mister_rf, I don't think youve posted the example...
Thank you very much for your reply Tahmid. Do I implement a DC level shifter using a difference amplifier? Is it ok if you can elaborate on what sort of op amp setup i should be using/looking for?
thanks a lot again.
Thanks for the reply again John,
I have decided just to use the setup I have stated on my post where the IR transmitter and receiever circuit is connected to a BJT to increase the voltage difference and have an analog output. I may consider the capaciflector approach, but because I've already...
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