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RobH
Guest

Thu Feb 20, 2020 7:51 pm   



I've been trying out a couple of Automatic Fence Lighting circuits with
a 444, 741 and ldr.

I posted earlier about the circuits above , and the problem I had was
that I could not get a buzzer to work from pin3 of the 555.

I came across this
https://www.electronicshub.org/how-555-timer-ic-testing-circuit-works/

and found that out of x3 555's I had which I thought were faulty, only 1
was. The other 2 worked fine when used in that circuit, as both leds
flashed on / off alternately.

When I replaced the good?? 555 back in the fence Light Circuit I built,
there still no output to a buzzer.

So by logical deduction, I can only assume that the Light Fence Circuit
I used/built has a fault in it somewhere.

Any pointers as to where I should look.

default
Guest

Thu Feb 20, 2020 8:30 pm   



On Thu, 20 Feb 2020 17:51:58 +0000, RobH <rob_at_despammer.com> wrote:

Quote:
I've been trying out a couple of Automatic Fence Lighting circuits with
a 444, 741 and ldr.

I posted earlier about the circuits above , and the problem I had was
that I could not get a buzzer to work from pin3 of the 555.

I came across this
https://www.electronicshub.org/how-555-timer-ic-testing-circuit-works/

and found that out of x3 555's I had which I thought were faulty, only 1
was. The other 2 worked fine when used in that circuit, as both leds
flashed on / off alternately.

When I replaced the good?? 555 back in the fence Light Circuit I built,
there still no output to a buzzer.

So by logical deduction, I can only assume that the Light Fence Circuit
I used/built has a fault in it somewhere.

Any pointers as to where I should look.


I give up.

RobH
Guest

Thu Feb 20, 2020 8:43 pm   



On 20/02/2020 18:30, default wrote:
Quote:
On Thu, 20 Feb 2020 17:51:58 +0000, RobH <rob_at_despammer.com> wrote:

I've been trying out a couple of Automatic Fence Lighting circuits with
a 444, 741 and ldr.

I posted earlier about the circuits above , and the problem I had was
that I could not get a buzzer to work from pin3 of the 555.

I came across this
https://www.electronicshub.org/how-555-timer-ic-testing-circuit-works/

and found that out of x3 555's I had which I thought were faulty, only 1
was. The other 2 worked fine when used in that circuit, as both leds
flashed on / off alternately.

When I replaced the good?? 555 back in the fence Light Circuit I built,
there still no output to a buzzer.

So by logical deduction, I can only assume that the Light Fence Circuit
I used/built has a fault in it somewhere.

Any pointers as to where I should look.

I give up.

give up what?


default
Guest

Thu Feb 20, 2020 9:45 pm   



On Thu, 20 Feb 2020 18:43:50 +0000, RobH <rob_at_despammer.com> wrote:

Quote:
On 20/02/2020 18:30, default wrote:
On Thu, 20 Feb 2020 17:51:58 +0000, RobH <rob_at_despammer.com> wrote:

I've been trying out a couple of Automatic Fence Lighting circuits with
a 444, 741 and ldr.

I posted earlier about the circuits above , and the problem I had was
that I could not get a buzzer to work from pin3 of the 555.

I came across this
https://www.electronicshub.org/how-555-timer-ic-testing-circuit-works/

and found that out of x3 555's I had which I thought were faulty, only 1
was. The other 2 worked fine when used in that circuit, as both leds
flashed on / off alternately.

When I replaced the good?? 555 back in the fence Light Circuit I built,
there still no output to a buzzer.

So by logical deduction, I can only assume that the Light Fence Circuit
I used/built has a fault in it somewhere.

Any pointers as to where I should look.

I give up.

give up what?


Beating a dead horse, of course.

RobH
Guest

Thu Feb 20, 2020 9:45 pm   



On 20/02/2020 19:51, default wrote:
Quote:
On Thu, 20 Feb 2020 18:43:50 +0000, RobH <rob_at_despammer.com> wrote:

On 20/02/2020 18:30, default wrote:
On Thu, 20 Feb 2020 17:51:58 +0000, RobH <rob_at_despammer.com> wrote:

I've been trying out a couple of Automatic Fence Lighting circuits with
a 444, 741 and ldr.

I posted earlier about the circuits above , and the problem I had was
that I could not get a buzzer to work from pin3 of the 555.

I came across this
https://www.electronicshub.org/how-555-timer-ic-testing-circuit-works/

and found that out of x3 555's I had which I thought were faulty, only 1
was. The other 2 worked fine when used in that circuit, as both leds
flashed on / off alternately.

When I replaced the good?? 555 back in the fence Light Circuit I built,
there still no output to a buzzer.

So by logical deduction, I can only assume that the Light Fence Circuit
I used/built has a fault in it somewhere.

Any pointers as to where I should look.

I give up.

give up what?

Beating a dead horse, of course.


I suspect that you are an expert electronics engineer and I am well
below you. If you can't help , then please don't reply.

In fact, no, reply if you want, as I will go elsewhere.
Bye

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