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Hi,
Some of these buttons have to drive a relay which drives dc motor..Is it efficient to use single transistor or do i require two transistors? I saw some designs which uses two transistors to drive single relay..
All depends. I suspect the two transistor circuits needed to;
Do you know the current required to latch your relay?
yes although kinda have to know what relay you are using; latching voltage and current
do you know if its a 12V relay? can you include a photo of it? can you connect it to 6V, and if that fails then try 12V? if either works, can you then measure the current?
Guess you will need at least voltage gain: **broken link removed** and **broken link removed** give the main idea. But common-emitter inverts the signal [Ov in gives Vout], so you will need two in series
Hi,
whenever a button is pressed, the 12v dc motor has to move forward, reverse..
forward, reverse? what do you mean?
So the operation is OFF-FORWARD-REVERSE?
I think everyone assumed by your OP it was ON-OFF.
It is better to clearly and fully state what you are needing in the first post.
There are 3 relay models shown on the pdf file - would you be getting the 12V model?