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Archives for February, 2010

Making 15W FM RF Amplifier using 2SC253

This is a FM RF amplifier which build based on RF Power Transistor 2SC2539. 2SC2539 is a silicon NPN epitaxial planar type transistor designed for RF power amplifiers in VHF band mobile radio applications. L1: 2T Coil diameter:4mm L2: in series 6pcs Toroidal ring L3: 4T Coil diameter:10mm L1: 3T Coil diameter:10mm

Electronic Circuit Diagram driver bridge pre power Amp 20Hez with 2SC1469

Electronic Circuit Diagram driver bridge pre power Amp 20Hez with 2SC1469

audio beep Circuit

Sensore Audio Switch circuit

Sensore Audio Switch circuit Diagram using MC2830

Electronics Schematic Diagram alarm Door Bell circuit using IC UM 66 part 1

This is a slight modification of that circuit. In the previous circuit you have to keep the switch pressed for making the IC play the full music. Here if once the push button is pressed C1 is charged and the transistor Q2 will keep the IC playing the music till it ends. The time for […]

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