Making Process Portfolio: Day 6

Project 28: Rain Drop

This project is another entertainment circuit which involves the use of a low-frequency oscillator in order to simulate the sound of a rain drop.

The components are similar to those used in the electronic cat noise, and are connected in this order.

15-48, 16-49, 23-69-72-74-91, 24-64-52, 40-108, 45-25-70, 50-63-73-71, 51-109-106, 92-105, 42-43

 

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Project 28: Electronic Rain Drop

 

The connection between 15 and 48 connects the top terminal of the speaker, to the top left side of the transformer with a medium sized red wire.

The connection between 16 and 49 connects the bottom terminal of the speaker, to the top right side of transformer with a short white wire.

The connection from 23 to 69 to 72 to 74 to 91 connects the base terminal of the Q3 NPN transistor, to the positive terminal of a 10 micro farad capacitor, to the right terminal of the 100 micro farad capacitor, to the right terminal of the 220 micro farad capacitor, to the left terminal of a 22k resistor with two medium sized red wires and two small white wires.

The connection from 24 to 64 to 52 connects the collector terminal of the Q3 NPN transistor, to the right terminal of a 0.1 micro farad capacitor, to the bottom right terminal of the transformer with a medium sized red wire and a small white wire.

The connection between 40 and 108 connects the positive terminal of a battery, to the left terminal of the key with a medium sized red wire.

The connection from 45 to 25 to 70 connects the negative terminal of a battery, to the emitter terminal of the Q3 NPN transistor, to  the right terminal of a 10 micro farad capacitor with a medium sized blue wire and a small white wire.

The connection from 50 to 63 to 73 to 71 connects the bottom left terminal of the transformer, to the left terminal of a 0.1 micro farad capacitor, to the positive terminal of a 220 micro farad capacitor, to the positive terminal of a 100 micro farad capacitor with three small white wires.

The connection from 51 to 109 to 106 connects the bottom middle transformer terminal, to the right terminal of the key, to the middle terminal of the control with a long yellow wire and a small white wire.

The connection between 92 and 105 connects the right side of a 22k resistor, to the left terminal of the control with a medium sized red wire.

And finally the connection between 42 and 43 connects the negative terminal of a battery, to a positive terminal of a battery with a small white wire.

Once all the connections have been made upon pressing the key, the speaker creates an oscillating raindrop sound. By turning the control clockwise while holding down the key the frequency of the raindrops decreases.

To hear the raindrop noise please click here

The raindrop noise- like the electronic cat noise, uses a low frequency oscillator which is composed of the Q3 transistor, the transformer, the 100 micro farad and 220 micro farad capacitors connected in parallel, and the 0.1 micro farad and 10 micro farad capacitors in series.

Final Thoughts

What interested me about this project was the alternating oscillation of the raindrop sound. The raindrop sounds were more uneven and sporadic than consistent like the frequency of the cat noise.

Sources: Maxitronix Electronic Lab Owners Manual

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