1. guclusat

    V-F converter LM324

    Here we're going to make a V-F converter. What do you think V and F stand for? Not so difficult, V for voltage and F for frequency. So a V-F converter is a device to convert a voltage to a frequency. The schematic shows you that U1:A is an integrating circuit and outputs an integrated voltage...
  2. guclusat

    RS485 to RS232 converter

    RS485 is an alternatve for RS232 for long distances. Maximum length of the cable for RS232 is only 15m. For RS485 it is about 1200m. In addition you can connect many devices to RS485 bus (unlike RS232 — only 2). Send/receive mode is selected by RTS signal. The converter was designed to be as...
  3. guclusat


    This project is a 8-12Vdc to +48Vdc DC-DC converter based on MC34063 switching regulator. Description It’s a simple project of a DC-DC converter to make a phantom power supply for professional microphones. It can deliver 15-20mA at 48VDC. It ‘s based on MC34063 DC-DC step-up, step-down and...
  4. guclusat

    Automotive 12V to +-20V converter (for audio amplifier)

    The limitation of car supply voltage (12V) forces to convert the voltages to higher in order to power audio amplifiers. In fact the max audio power x speaker (with 4 ohm impedance) using 12V is (Vsupply+ - Vsupply-)^2/(8*impedance) 12^2/32 = 4.5Watts per channel, that is...