I'm a novice and it's taken me about a week to get to the point I'm at so hopefully I'm providing enough information.
I'm setting up a 555CN astable circuit using the schematic shown here. R1 is 270k, R2 150k, and C1 is 10uF. I'm using a 12Vdc source (23A alkaline battery) so I'm measuring around 8Vdc on pin 3. The device I'm powering needs 9-12Vdc and pulls around 82mA @ 12V.
Since the 8Vdc on pin 3 of the 555CN isn't enough to power my device, I need to add either a relay or a FET. I've done some Googling and am more confused now than when I started. I'm interested in whichever will be the most efficient since both the timer circuit and the end device will run off the same battery.
In this scenario should I use a relay (reed or electromechanical) or a FET? Also, what ratings should I look for on the relay or FET? I've also seen a few circuits that have diodes as well as a relay in them. Are they needed and if so, what specs should I look for? I buy components at Radio Shack so if you can provide the part number for a suitable relay/FET I'd appreciate it as well (not required, just would be handy).
Mez
PS - Can I use a CMOS 555 in this scenario? As I mentioned earlier the less power and more efficient the circuit is the better.
I'm setting up a 555CN astable circuit using the schematic shown here. R1 is 270k, R2 150k, and C1 is 10uF. I'm using a 12Vdc source (23A alkaline battery) so I'm measuring around 8Vdc on pin 3. The device I'm powering needs 9-12Vdc and pulls around 82mA @ 12V.
Since the 8Vdc on pin 3 of the 555CN isn't enough to power my device, I need to add either a relay or a FET. I've done some Googling and am more confused now than when I started. I'm interested in whichever will be the most efficient since both the timer circuit and the end device will run off the same battery.
In this scenario should I use a relay (reed or electromechanical) or a FET? Also, what ratings should I look for on the relay or FET? I've also seen a few circuits that have diodes as well as a relay in them. Are they needed and if so, what specs should I look for? I buy components at Radio Shack so if you can provide the part number for a suitable relay/FET I'd appreciate it as well (not required, just would be handy).
Mez
PS - Can I use a CMOS 555 in this scenario? As I mentioned earlier the less power and more efficient the circuit is the better.