Free circuit schematics - wiparat.com

This Circuit is based on the UM5100 which can record speech into a digital memory and then play it back. The device is designed to be used directly with static RAM’s up to 256K bits, or with EPROM ’s or ROM’s for playback only. High quality voice reproduction is possible and note that it is [...]

Here is a circuit mini Organ, It very easy circuit and low cost.
The important part of the circuit is 2N4891 FET Transistor,It is Tone Oscillator Generator.
R1-R9 is Control Tone sound music,To change value C1 ,so output change Frequency all range.
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