FreeBaseBuzz
New Member
Hi,
I have a motion sensor door chime/alarm and would like to alter it slightly to drive a solenoid. The alarm is designed to run off a 9v battery, but the solenoid requires 12v.
Also the signal line from the sensor goes positive at 2.7v going into the IC that generates the chime sounds.
Could someone please help me design a simple circuit to drive the solenoid?
I guess there are two parts to this.
1. a step-up DC-DC converter to get the required 12v from the 9v supply.
(alternatively, I could power the system using 12v wall transformer and somehow drop the 9v for the motion sensor off that)
2. some sort of transistor/relay circuit to switch on the 12v solenoid when the 2.7v is detected on the motion sensor circuit.
I have a couple of PN2222's, 2N3904's and 2N3906's lying around here if they can be used somehow.
I have some basic electronics knowledge, but not enough to design this sort of thing from scratch.
All this effort to try and keep the chickens out of the veggie patch, maybe I should just invest in a fence
thanks in advance,
FBB
I have a motion sensor door chime/alarm and would like to alter it slightly to drive a solenoid. The alarm is designed to run off a 9v battery, but the solenoid requires 12v.
Also the signal line from the sensor goes positive at 2.7v going into the IC that generates the chime sounds.
Could someone please help me design a simple circuit to drive the solenoid?
I guess there are two parts to this.
1. a step-up DC-DC converter to get the required 12v from the 9v supply.
(alternatively, I could power the system using 12v wall transformer and somehow drop the 9v for the motion sensor off that)
2. some sort of transistor/relay circuit to switch on the 12v solenoid when the 2.7v is detected on the motion sensor circuit.
I have a couple of PN2222's, 2N3904's and 2N3906's lying around here if they can be used somehow.
I have some basic electronics knowledge, but not enough to design this sort of thing from scratch.
All this effort to try and keep the chickens out of the veggie patch, maybe I should just invest in a fence
thanks in advance,
FBB