basic infrared transmitter circuit schematic

Basic Infrared Transmitter Circuit

This infrared tranmitter is intended for use with this infrared receiver.
It works with 2 – 1.5V batteries or a 3V lithium battery. To give a compact infrared device assembly and still a good frequency stability, the circuit uses a oscillator with outpashing network. Current consumption depends on power supply and duration as S1 remains pressed. When Ub = 2V, the frequency is 29.3 kHz, the LEDs top current is 25 mA and total current consumption is 27 mA.

When Ub = 3.2 V, freq is 30.4 kHz, the top current through each led is 64 mA and total current consumption is 67mA. At this voltage the distance between receiver and transmitter prototype was 13 meters.
Current consumption may be reduced by connecting with S1 in series a parallel group RC (R = 10 k Ω; C = 1000uF/6.3V).
By pressing S1 result only a short current impulse. Even if S1 remains pressed, the current can not exceed 300uA.

Infrared transmitter circuit schematic

basic infrared transmitter circuit schematic


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  • Agus

    (Toy) If I was writing this hecliopter’s review on the first day I got the copter, I would have given it 4 stars. It had excellent handling characteristeics, and the response to the sticks’ was appropriate and proportional (not over or under-responsive.) However, the 4th channel drift’ control was problematic, as a left drift caused the hecliopter to accelerate upward as it shifted left, and plummet downward as you drifted’ it to the right. But all in all, I liked it alot until day two’. Then, with just a mere bump against the cushioned arm of my sofa, it stopped flying. Upon inspection, I saw that the main motor shaft’s gear, that turns the lower propeller’s full size gear, had come off the motor’s shaft, and, of course, would then no longer turn the lower propeller’s gear. This should NOT have happened with such a minor bump’. In fact, I tried to cannabalize a gear from another defunct copter’, and it was a struggle’ to get that gear OFF the motor’s shaft. But with this Drift King, apparently, someone at the big C factory had barely inserted the tiny gear sufficiently onto the main motor’s shaft, and one little bump of the helicoter caused it to dislodge. I guess when you buy a 4 channel copter for under $50, you have to expect that they’ve tried to save money somewhere, and their production quality control standards is where they apparently cut back on costs. [Follow-up: Amazon discontinued this model for a few weeks, then brought it back and sold it through Amazon rather than through their ‘marketplace’ So, I figured, that with an easier-to-return policy, and the hope that the problem with the gear had been fixed by the time this model had been ‘brougt back’, I took a chance and ordered it again. And I was happy to find, that despite disassembling it to put some super glue on the gear that was originally the problem (i.e. falling off the motor’s rotor shaft), the entire inside had been reconfigured now, so it was less likely that the gear probelm could occur in this newer version. And after flying this new version for 2 days, and having a number of ‘collisions’, it’s still going strong. (But I’ll let you know if that changes). By the way, as this new/2nd heli ‘used to’ have the nice ‘proportional responsiveness’ to stick movements as the first version, this ability seems to be deteriating over time. Also, this is just about the only heli that, if you give it too much throttle just after a full charge, it won’t hit the ceiling…it defintely shoots upward, but it’s just heavy enough to prevent a ceiling collision. As for flight time, 40 minutes of USB charge gave me about 6-7 minutes of flight…but that was just a small ‘circling’ test in order to test its maximum flight duration under ideal conidtions.]

  • praveen

    i need theory about ir transmitter and receiver

  • Abdul Rahman

    Can u please send me some useful ieee papers about the sensors?

  • kiki

    can u tell me step by step??help me please

    • electrolover

      I am so sorry, but I cannot help you with any of the projects presented on this website. I am so busy at my work and I can’t take care of this site anymore 🙁

  • Sina

    Excellent circuit indeed.
    It’s simple and works good.
    thanks alot

    • brody

      hi thre. im a student doing electronics in secondary level, so this is quite complicated, would you mind explaining it and what it does in laymen terms?

  • javeria rahman

    please send documentation of ir remote switch

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