Hi bhuvaneschnick,
Your question is similar to one asked nine years ago in this forum, on Radio Controlled cars:
https://www.electro-tech-online.com/threads/r-c-toy-car-transmitter-circuit.14925/
The opinion of the respondents then (one of whom is also a respondent to your current question) was that it would be far cheaper and safer to buy a ready-made unit (compliant with RF emission regulations) than it would be to try to build one of your own. What was true then is even more true today. A quick Google search produced this result:
https://www.oznium.com/remote-switch
which I presume is legal in ITU Region 1 (USA), although the operating frequency is unfortunately not mentioned. India is in ITU Region 3 and will have different frequency allocations for Low Power devices (although the 4th customer reviewer for the above product, was located in Australia, which is also in ITU Region 3, and appears to have gotten away with using his device
).
But since you can disagree with the consensus advice and search out a transmitter circuit and construct it regardless
, I would suggest that instead of 23 MHz, you use the nearby frequency of 27.120 MHz. This is bang in the centre of the ISM (Industrial, Scientific & Medical) frequency allocation in the 6 metre band in India (see item IND10 on page 151, here :
**broken link removed**
Indeed, the above ISM frequency band is free of licencing requirement, worldwide:
https://en.wikipedia.org/wiki/ISM_band
You can construct an unlicenced transmitter at that frequency provided that its under 5 watts, which should be easily achievable
. I would
strongly advise you to use a crystal controlled TX design, with the crystal frequency of 27.120 MHz and to use one of the several Remote Control transmitter circuits in the 27 MHz region, which are available online. Such crystals are both widely and cheaply available, eg:
https://uk.farnell.com/txc/7m-27-120meeq-t/quartz-crystal-27-12-mhz-smd/dp/2101321