Pinpointer with discrimination "Cat-FM" on ATMega328P

[void118]

the buzzer is pac-1205

PAC-1205 It't not piezo buzzer, It Is electromagnetic transducer with 6V max. supply, It Is first, and second when you detouch base transistor from sound I see normal consumption.
Conclusion - you have misstake with your sound transistor connection or It's not working properly. Check your transistor please, see In attachment.
Connect emmiter to 5V Instead battery, remove 1K parallel resistor from your transducer.

I hope you are using BC557 In the sound circuit?

[useus]

with base of transistor disconnected and buzzer connected 15.6ma


now the buzzer does not emit background noises as it did before

[useus]

the buzzer is pac-1205

[void118]

It seems to me that you have electromagnetic speaker that just looks like buzzer, and because reactive resinstance on sound frequency Is lower thar active resistance you see such consupmtion.
But anyway, 28mA In standby mode Is too much.

[void118]

with detached buzzer 28ma without detection
30.5ma with detection
with connected buzzer 700ma without detection
800ma with detection

the buzzer on the capacitor marks me 47uf and 45 ohm on resistance

however the buzzer is passive, powering it directly does not emit any sound

First, passive piezo buzzer Is equal to capacitor and It can't pass constant current!, It's not piezo buzzer.
My passive piezo buzzer has 10nF capacitance and has endless resistance.

Second, 28mA without detection Is too much, check your schematic please, I mean MCU consumption(~15mA), generator consumption(500uA).

Third, disconnect the base of sound transistor from MCU and check current again, may be you have deffect transistor too.

Show me your buzzer please)

[useus]

with detached buzzer 28ma without detection
30.5ma with detection
with connected buzzer 700ma without detection
800ma with detection

the buzzer on the capacitor marks me 47uf and 45 ohm on resistance

however the buzzer is passive, powering it directly does not emit any sound

[void118]

Check your pizeo buzzer with multimeter please, It must behave like capacitor but not like resistor.

[void118]

Look, In silent mode , when device don't see target, sound transistor Is strongly closed, and It opens with PWM pulses when target comes up, If your buzzer Is not working correctrly, we can see short circuit effect. Show your buxxer please.

[void118]

hi, the circuit is checked and is fine, probably the 28ma I measured were during the measurement, I had the multimeter near

Thus, the problem Is In your sound circuit, try to connect simple 16 Ohm speaker without 1k In parallel.

[useus]

Hi, check your PCB, my circut consumes 15mA In silent, and 29 mA when detecting target.

hi, the circuit is checked and is fine, probably the 28ma I measured were during the measurement, I had the multimeter near

[void118]

the circuit works but there is a problem, the buzzer heats up a lot and, approaching it to the ear, it hums slightly, so I checked the amperage of the circuit, result 700ma.

disconnecting the buzzer the circuit consumes 28ma.

obviously I'm using the passive buzzer that I have available, but something is not right. a help?

Hi, check your PCB, my circut consumes 15mA In silent, and 29 mA when detecting target.

It looks like short circuit In the board.

[useus]

the circuit works but there is a problem, the buzzer heats up a lot and, approaching it to the ear, it hums slightly, so I checked the amperage of the circuit, result 700ma.


disconnecting the buzzer the circuit consumes 28ma.


obviously I'm using the passive buzzer that I have available, but something is not right. a help?

[void118]

New video on my channel related to PCB design and some things about second revision.

https://youtu.be/67yV1IAClt0

[void118]

Finished and working! Thanks void118
Today I try firmware 1.51 and build definitive coil

note the crystal sideways, like the hole I made

Congratulations my friend!

[useus]

Finished and working! Thanks void118
Today I try firmware 1.51 and build definitive coil



note the crystal sideways, like the hole I made