Free electronic circuit design and schematic diagram
Many new computers now only has USB port, and this serial to USB adapter might be the only help for old devices that provides only RS232/COM Port. This serial adapter uses FT232 USB-RS232 converter IC from FTDI (Future Technology Devices International). The main features of this USB serial adapter chip are: 384 byte receive buffer / 128 byte transmit buffer […]
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RS485 interface gives some more benefits compared to RS232: simplicity and the robustness for long distance transfer. RS485 is simpler because it uses only two wire (or a single pair) to carry out the data in bidirectional manner, using RS232, we need 3 wires at minimum to carry the data bidirectionally. RS485 cable length can be as long as 1.2 […]
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I some cases, a differential input is needed for voltage measurement. Using the only one operational amplifier, you can build an adapter to provide a floating input for your ground-referenced voltmeter. Use 1% tolerance metal film resistor for R1 and R2. Adjust VR1 to give zero voltage output when the input probe is shorted. You can use voltage supply +Ub […]
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