Hi All,

I've attached (if I pressed the right buttons) front and back views of the transmitter part of a cheap wireless doorbell.

The problem I have is that when I press the doorbell button, it makes the ding-dong sound, but only once. What I want is for the transmitter to transmit, and the receiver to ding-dong, continuously (until switched off).

I've tried everything that my layman's brain can think of... holding the doorbell button down, putting a paper clip between numerous combinations of the soldered bits on the back of the PCB, etc. Nothing I've done makes the ding-dong go continuously :-(

I'm guessing that the microswitch is a type that sends just a single pulse rather than a continuous one.

Does anyone know how I can achieve the desired effect ?

Thanks,

Bob

 

what would happen if you are not home and the paperboy rang the bell?

 

Hi, and welcome to the forum.

A better picture of the PCB backside would be nice. If you have a scanner, you can try to scan it.

 

Seems like you'd want the reset on the bell side, not the transmitter side, right? If so, you'd want the transmitter to work as it currently does, sending a signal just once, and you'd want the repetitive loop on the receiving end. That would also be much friendlier in terms of battery consumption.

 

The doorbells I installed last year will not "ding" until you let go of the button, so...what ebeowulf said.
Do it on the ringer end.

 

what would happen if you are not home and the paperboy rang the bell?

No problem, I wouldn't hear it

 

Hi, and welcome to the forum.

A better picture of the PCB backside would be nice. If you have a scanner, you can try to scan it.

Backside attached. Not as big as Kim Kardashian's but hope it's good enough

 

No problem, I wouldn't hear it

Yes, you would. When you got home and find out that you need to replace the battery.

 

Seems like you'd want the reset on the bell side, not the transmitter side, right? If so, you'd want the transmitter to work as it currently does, sending a signal just once, and you'd want the repetitive loop on the receiving end. That would also be much friendlier in terms of battery consumption.

The doorbells I installed last year will not "ding" until you let go of the button, so...what ebeowulf said.
Do it on the ringer end.

OK, sounds hopeful. Can you explain what I'd have to do on the ringer side? Will it help if I send scans of the ringer front and back ?

 

Yes, you would. When you got home and find out that you need to replace the battery.

Planning to run it off a 12v DC transformer.

 

Hello,

I have resized and cropped your images.
Please keep the image sizes smaller as you did.

Bertus

 

Hello,

I have resized and cropped your images.
Please keep the image sizes smaller as you did.

Bertus

Thank you, Bertus, I didn't know how to do that ! ! !

 

Hello,

What system do you use?
For windows and linux there is the gimp available.
http://www.gimp.org/
With that you can resize, crop, adjust brightness and contrast and more.

Bertus

PS I am using ColourPaint on my linux machine for the resize and crop.

 

I have Windows XP. I'll try the gimp. Is it what people call a "snipping tool" ?

 

OK, here are scans of the front and back of the receiver/ringer side.
How do I add a repetitive loop, please ?
Thanks,
Bob

 

Hello,

Are you using a flatbed scanner for the pictures?
Can you position the PCB back in the corner of the scanner and set the resolution a step higher?

Here I used even 1200 DPI on a PCB:

Now you can read the values of the resistors.

Bertus

 

I'm sorry, I think this is the best scan I can do.

 

Hello,

On wich resolution did you make the scan?
Is the PCB close to the glassplate?

The printer/scanner I own has a selectable scan resolution of 75,100,150,200,300,600 and 1200 DPI.

Bertus

 

I think it was on 200.
I have tried it on 2400 and 1200 but the PCB comes out as a black splodge !
I will try 300 and 600.​

 

300 and 600 attached. No better :-(