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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

Constant high current regulator – circuit modules

Constant high current regulator – circuit modules using BD140, 555, 3041, BC546, 4060 Constant-Voltage Constant-Current Battery Charger – BD140, 555, 3041, BC546, 4060

How to read Resistor Color Codes?

How to read Resistor Color Codes? Here CODE COLOR RESISTOR for Resistor color coding scheme and calculator in JavaScript. resistor color code Calculate Resistor Values from Color Codes. Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Gray, White. Black, Brown, Red, Orange, Yellow, Green How to read Resistor Color Codes? Here CODE COLOR RESISTOR for […]

HD Receiver Block Diagram

HD Receiver Block Diagram of Didital Typical av Receiver

A simple switching transistor circuit

A simple switching transistor circuit to test

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