Other Projects > Chirper

Finished Chirper

Finished Chirper

Chirper Schematic

Chirper Schematic -
Download it here

Circuit used: The Chirper was inspired by Sparky's Cricket Chirper circuit.

Behavior of Circuit: It does pretty much what it says. It chirps. Not very loudly though. Sparky lists some modifications you can do to the circuit to change it up a bit.

Construction Notes: Parts List: R1 100K potentiometer, R2 4.7K resistor, R3150K resistor, R4 100K resistor, R5 1K resistor, C1 4.7ufd polarized capacitor, C2 2.2ufd polarized capacitor, D1 Small Diode, 556CN Dual Timer IC, Piezo speaker, 3V battery. The entire PCB is 1-3/4" x 1-3/8".

This was quite the learning experience! I ended up making this project 4 times. I kept printing it out wrong, and I did not notice. I had to correct my toner transfer page to reflect this.

Here are a few words of wisdom that I learned from this:

1.When using DipTrace to make PCBs, you just print the bottom. The top gets mirrored and flip the text. This is very important.
2. Breadboard your project first. This does a couple of things for you. It makes sure you have good parts. It also makes sure it will perform like you want it to with the parts you have.

On with the project. I used the toner transfer method to make the PCB. See my project page on Making PCBs With Toner Transfer. After etching and silk screening, I just soldered it up. The first time I put the 556 timer chip in backwards and the board was etched backwards. I blew the chip. The second time the traces were too close to the copper pour and I kept shorting it out. It didn't help that I did not notice that the board was etched backwards...

Fourth time is a charm! At first I thought it still wasn't working, but it was. Just very quietly... Not exactly what I was looking for. After trying a dozen or so speaker/piezo, I found the loudest one. Still not as loud as I would like, but it does work. I mounted the battery on the bottom with hot melt glue. I covered the + and - leads first and let them cool, then put a blob in the middle.

So the project didn't turn out like I had planned, but it wasn't a total failure either. It does work. And I relearned how to use DipTrace. Refreshed my PCB making skills at the same time. All in all, not too bad!

If you would like a copy of the DipTrace files, drop me an email!

 

After Toner Transfer

After toner has been transferred

Board etching

Board etching in Ferric Chloride

Etched Board from the bottom

Etched Board from the bottom

Etched Board from the top

Etched board from the top

Finished Chirper

Finished Chirper

Bottom of Chirper

Finished Chirper

 

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