UM66 Datasheet | Unknown Manufacturer

Description (IC and Transistor) Precaution Modification for adaptation This is the simplest ever musical calling bell that can be easily built. It uses the musical 3 pin IC UM66 and a popularly known Transistor BC548b. The circuit can be made even without soldering and the ideal for the first electronic project for newbies. Here the musical IC UM66 generates the music when it receives supply and drives a small speaker through a class c amplifier using silicon transistor BC548b. Description : UM 66 Fig-1 : Connection Diagram The connection diagram is shown below. The ponent details with cost is also with this. The battery supply should be kept in a battery container to ensure the connection. The volume of the sound of this circuit is so much that it can be used as a calling bell. If anyone want to reduce the volume of the circuit then insert a resistance () in place of the blue line connection. In this circuit please don't give the supply beyond 3 volt without modification as the IC may got damaged. It is better that you should not run this circuit in Eliminator as most of the available eliminator don't have a good filter built in and have no precision over voltage protection. The circuit should not be run in Rechargeable battery also if the Speaker resistance is less than 8 Ohm and may burn the Transistor. .. ponent Sl No 1 Item IC UM66 Specification Cost Three pin IC, like plastic case transistor. Rs. 6 to Rs. 20 Package code TO-222. depending upon the music and part code. -same Rs. 1/- to Rs 2.5/depending upon the make. Transistor BC548b Speaker 2”-4” Speaker having diameter 2 inch to 6 inch Rs. 10/= to Rs35/-. with 50gm to 200 gm magnate and the resistance is more than 4 Ohm. Any insulated wire. Five coloured wire can Each 1 M = Rs 2/- to Rs be used. 3.5/Any type. Rs 1/- to Rs 25/Any Dry cell battery, Alka;ine battery. Rs. 4.5/- to Rs. 25 each. Rechargeable can be connected with protection/Modification. Any type but should be matched with the Rs. 7/-...