UM66 is CMOS technology melody integrated circuit especially used in to give the output from speaker, when we reset the circuit UM66 will play the melody. The following schematic is for UM66 or BT66 musical IC. You need very few components to make this circuit. Pin configuration for UM66 is. Here is one listing from China for the UM66, and another one from France. Some IC become obsolete and may not be available in market.

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So I’ll suggest changing your schematic to some other doorbell circuit by searching on google: You can even include a switch in the circuit to keep oc IC play the full music.

Assemble the circuit on a good quality common board. If the musical bell is not working check the emitter, base, collector pins of transistor and pins of IC UM66 are connected properly.

This circuit uses a 3 terminal IC UM How to use Mhz RF transmitter and receiver modules with arduino June 14, You could quite easily make a similar circuit using a small micro, a timer or two, using discrete transistors, etc.


How to use a relay November 15, Remote operated musical bell. Leave a Reply Cancel reply Your email address will not be published.

Now connect the battery and hear the melody sound. It has a built in ROM programs for playing music.


Make sure that you do not give more than 4. Home Questions Tags Users Unanswered. Virgin Galactic — Commercial Space Flight. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the iic is subject id these policies. How to use variable resistors November 15, Dear sir, could you forward me a 30second sound circuit that activated by another speaker out alarm clock Thanks shyaman.

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How to use UM66 or BT66 Musical IC

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I’m trying to build a circuit of a Doorbell, but it’s very hard to find ICs from local stores. Click on the video to see the output.


Dark sensor on breadboard September 8, So maybe it’s better to move on to another circuit. Capacitor C1 is meant for noise suppression. Thanks for the CMOS technology. Your email address will not be published. Im66 in resource shortage its good to change plan. Some IC become obsolete and may not be available umm66 market. What can be done to strengthen the multiplier circuit?

IC UM66 – sajilv’s Blog

Choosing Motor For Robots. C1 is used to decouple power supply to avoid inter-modulation between output and IC.

The speaker can be driven by an external npn transistor connected to the output km66 UM Ding Dong Sound Generator.

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Choosing Battery for Robots. Take the speaker or buzzer and connect it between the collector pin and positive rail.