Hi,
What can I use to switch on device that is 24V DC about 8-9amps … I burned a few relays … triac? which one?
Thanks
Relays are usually the most foolproof as long as they are rated properly.
MOSFETs are also popular.
NOT a TRIAC for DC. TRIACs latch-on until current falls to zero which is fine with AC where it will turn-off at the next zero-crossing.
Bigger relay. SSR for DC "Hockey puck"
(AC shown, DC similar)
this is huge ... will try with IRL3705
you need 24v @ 8A ~ 200W! Youll not control that with a SOT package. Even if efficiency is 98% you'll still have to dissipate 4W.
You also need to know what sort of load too - an inductive load will need a fly back diode and any relay down rated .m
Google for the correct relay ( not those toy blue ones )
Hi,
Can you please post a link to data/specs of the power supply?
Some power supplies have an ENABLE pin that turns the output on and off, it does not need amps of current to operate.
What is the application?
Can you please post a circuit diagram, showing how/where you are placing your switching devices?
Thanks.. Tom... 
It is powering a small digital amp ... they all share ground
Sorry for the hand draw.
Hi,
You will not be turning the supply off with that circuit, you need to read up on MOSFET operation and gate biasing.
The IRL3705N is a logic gate MOSFET, but the way you are using it the gate will never be 5V above the source pin of the MOSFET.
What is the part number/make specs of your power supply.
If it is 240Vac or 110Vac input, you may be better using a SSR and switching the AC input.
Did you try a relay, if so how did you wire it to the Arduino controller?
What is the current rating of the small digital amp?
Thanks.. Tom...
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