Modifying a Singing Greeting Card Answered
A while ago my wife got one of those singing Hallmark greeting cards. (This particular one played the Law and Order theme song) Well after a while it no longer played the song. I opened it up and found that there is a circuit board inside with a 3v button cell battery attached to it. I removed the board and the speaker and the battery and I'm pretty sure that I could attach wires to the two contact points and connect them to batteries that would complete the circuit and allow the theme song to play again.
What I want to know is if I need to take any special consideration when putting in a new battery(s). I was going to try to just put two AA batteries in series (1.5v +1.5v =3v, right?) but I don't actually know anything about electronics
and so I wanted to ask here if there were any resistors needed or if there were any differences between the button cell and the AA batteries that would require me to do something different.
While we're on the topic of these cards I just thought of a neat project. Design some sort of holder for the circuit boards that would allow them to act as sort of an interchangeable cartridge. Basically detach the speaker wires and battery contacts from various boards out of various cards and design some sort of holder with contacts for the speaker and power source at the appropriate points and be able to change out the different boards. Not really practical but sounds like fun.
I just thought of yet another question!
Would there be anyway to hook the board up to some sort of audio cable (in place of the speaker maybe) so that I could plug these into a computer and record the song off of the board in a digital format. (Again not very practical but sounds like fun.)
Anyway, this is my first post here and I'm sorry if it's a bit jumbled but I don't have a very organized mind and sometimes it's hard to put my ideas down in a succinct manner. I tend to just ramble on incessantly in a train of thought sort of manner until I think that I've said what I think I wanted to say.
In closing, I like this site and plan to be around for a while and learn as much as I can. If somebody would like to help me with these ideas/projects I would be happy to provide pictures of the circuit board and pieces that I have if it's necessary.
I'm using two AA batteries. I have a wire between the positive side of B1 and the negative side of B2 and wires coming off the open ends. I tried connecting the batteries from the spot where the negative side of the button cell was to the silver rectangle thinking that that would complete the circuit and make music. That didn't work. Then I noticed that the positive connection for the circuit was actually where the clip that secured the battery was before I removed it and that the positive and negative sides of the battery were going through a capacitor before touching the final contact. so I tried placing the positive wire up on the positive contact and then placing a wire from the positive contact to the final contact but that also didn't work. I don't have any solder and have been using electrical tape to secure the wires. The wires are a fairly thin (I don't know the gauge) stranded copper. I'm not sure if the wires aren't making good contact or if I'm just doing something wrong.