<img src="/images/finishedpieces/toy-index/toyindex_01.jpg" width="400" height="300" alt="casperelectronics toy index" title="casperelectronics toy index" />

A few months ago I decided to catalog a bunch of the simple, little toy circuits I had collected. 
I set up a little testing station and started removing the circuits from the toys. As I went, I took notes on the voltage rating, pitch adjustment settings, trigger points and any other details that would aid me in easily adapting these circuits into future projects. Then I numbered each circuit, labeled all the different points on the circuit board, recorded its sounds, stripped it down and filed it away.

<img src="/images/finishedpieces/toy-index/toyindex_02.jpg" width="400" height="300" alt="casperelectronics toy index" title="casperelectronics toy index" />

The following samples are the sounds I recorded from each circuit. All of them were recorded with a mic, so the sound quality is lacking on some of them, but they still give a good indication of what the circuit does and how the pitch adjustment sounds.