There are several options using pre-assembled modules. Working on it.

 

There are several options using pre-assembled modules. Working on it.

Thanks. I really appreciate the help

 

Is this 12 volt relay to control the 35 amp solenoid?

 

Is this 12 volt relay to control the 35 amp solenoid?

Yes

 

I just got camera out again and was testing it. I found an alarm button I didn’t realize it had. With my meter on 200 ac that’s lowest this cheap meter has. When I hit the alarm button with meter on speaker wires it went to 00.5. Being that there is a button on my phone to push to make alarm go off is there a better way to use that to trigger over the speaker wire? Does someone make a device like you drew out?

There are devices called "Voice Controlled Relays", VOX for short. Also called "sound operated switch." They are often used to control radio transmitters, to change from listen to talk when the operator speaks. So certainly such devices are available from various sources, but not intended for your exact application. So bit of adapting could be required.

 

I thought he said he had 4v....

I had the meter set on 2 ac and it would only register .05

 

This provides the required amplification with isolation from the speaker.

I like the circuit, but . . .

The trip point for IC1B is 2.16 V, while the DC value of the U1A output is 6.0 V. If you increase R6 to 210K, this raises the trip point to 8.13 V and you can eliminate C4 and R5 for the same circuit operation.

The static current of the LM358 is listed as 500 uA. With a 4.7K decoupling resistor, that is a 2.3 V drop across R8. Seems high to me, and it makes both the U1A operating point and U1B trip point vary as the U1B output current changes while charging C6. Better to decrease R8 and increase C5.

Sensitivity 50mv.

Hmmm. If that is 50 mV peak, then the output of U1A is 1.06 Vp. But the U1B trip point is 2.16 V (not counting R8). Even with the static voltage drop across R8, the trip point is 1.74 V.

ak

 

There are devices called "Voice Controlled Relays", VOX for short. Also called "sound operated switch." They are often used to control radio transmitters, to change from listen to talk when the operator speaks. So certainly such devices are available from various sources, but not intended for your exact application. So bit of adapting could be required.

Would one of them work off the power from speaker wire instead of the sound? The siren sound would prolly scare the pigs if the gate don’t close fast enough

 

Once again I suggest checking out "sound activated switch as a search item. The ones intended for control activate in much less than one second. Also, it should be simple to disconnect the internal speaker and replace that with a resistor., given that the TS has had access to measure the voltage.

 

Hmmm. If that is 50 mV peak,

That was incorrect. The calibration on my scope was off, it's actually appx 100mv.
Simpler circuit with 100mv sensitivity.

 

The siren sound would prolly scare the pigs if the gate don’t close fast enough

I wondered about that too.

 

That was incorrect. The calibration on my scope was off, it's actually appx 100mv.
Simpler circuit with 100mv sensitivity.
View attachment 286578

https://www.amazon.com/dp/B08N4FNFT...FTR&ref_=cm_sw_r_apin_dp_BVM4159B3GGSRZ3817GY
Could something like that work?

 

Could something like that work?

It could but would need modifications.

 

Could something like that work?

Maybe. The circuit probably is based on one of the application circuits in the MAX4466 datasheet. It shouldn't be to hard reverse-engineer the circuit on the board and work up a schematic. That gets you a preamp with adjustable gain. You still need an envelope detector, comparator, and solenoid driver.

ebay has a similar small board that is an sound detector module, a shell for an Arduino. Similar to the circuit in post #17, it has a preamp and comparator. ebay also has a basic relay module that gets you a 10 A contact set. The combination is around $5.00.

ak

 

There may be something useful in this thread.

 

Maybe. The circuit probably is based on one of the application circuits in the MAX4466 datasheet. It shouldn't be to hard reverse-engineer the circuit on the board and work up a schematic. That gets you a preamp with adjustable gain. You still need an envelope detector, comparator, and solenoid driver.

ebay has a similar small board that is an sound detector module, a shell for an Arduino. Similar to the circuit in post #17, it has a preamp and comparator. ebay also has a basic relay module that gets you a 10 A contact set. The combination is around $5.00.

ak

Does any one make one like post 30? Building something like that is a little above my know how. If I knew what everything was I might could put that together. Just curious I was trying to boost power from speaker wire to trigger a relay but could I use the speaker ground wire to trigger a relay or will that not produce good enough ground to trigger a relay either?

 

Does any one make one like post 30?

Check your inbox, conversation icon.

 

Does any one make one like post 30? Building something like that is a little above my know how. If I knew what everything was I might could put that together. Just curious I was trying to boost power from speaker wire to trigger a relay but could I use the speaker ground wire to trigger a relay or will that not produce good enough ground to trigger a relay either?

We have also suggested modules that provide functions, such as the sound trigger module. Really, one like that should have connections to the included relay, the power input, and the signal input, and that should be all that you need to provide the function you require.
But if you buy it on amazon the extent of support they can provide is to tell you the price and the shipping weight, which do not assist with the application or use.

 

I know exactly what he is trying to do. Several folks are trying to get away with a cheaper design. Trying to trigger a small 12v southco latch. 0.2 amps battery draw. I used a audio relay $100. I switched to a SSR that is 3-32v on control side and output is good for 25A up to 250v. However the signal from reolink speaker signal wires (hard wired back to input of SSR) isnt enough to trip SSR. SSR led lights up but isnt enough to trigger relay. Output of relay is series of 2 9v batteries. (Latch triggers at 9v-30v) no draw on batteries.

 

I know exactly what he is trying to do. Several folks are trying to get away with a cheaper design. Trying to trigger a small 12v southco latch. 0.2 amps battery draw. I used a audio relay $100. I switched to a SSR ($9) that is 3-32v on control side and output is good for 25A up to 250v. However the signal from reolink speaker wires (hard wired back to input of SSR) isnt enough to trip SSR. SSR led lights up but isnt enough to trigger relay. Output of relay is series of 2 9v batteries (18v). (Latch triggers at 9v-30v) no draw on batteries. Need to boost up voltage to at least 5v would be ideal. My fluke meter showed about 0.6v from camera. Im also looking at boosting the voltage up a little. (I have 2 traps that work) built 2 more gates and these reolinks wont trigger relay. Small voltage boost of the audio signal from camera would be nice. Something simple.