Isolated Full Duplex RS232C Interface Circuit

This is a Isolated Full Duplex RS232C Interface circuit. This circuit is used to protect PC from direct connection to hazardous voltages. Feature : isolate TxD and RxD lines from the PC serial port , baud rate of 19.2k baud, 5V supply. Component : capacitor, 1N4148 diode, LED, DB9, terminal block resistor, 6N137, CNY17-3, 74HC14. [chaokhun.kmitl.ac.th]

Single Transistor Nicad Battery Charger

This is a nicad battery charger circuit. Feature : Simple circuitry, charge nicad battery, changeable rate, single transistor, charging current 15mA or 45mA,for 1.5V and 9V battery, 12VAC supply voltage. Component : 1N4001 diode, Capacitor, 1N4148 diode, BD140 transistor, switch, resistor,transforme, Fuse.[zen22142.zen.co.uk]

Motorcycle Battery Charger

The following schematic diagram is a motorcycle battery charger. Feature : 115 or 220V Ac supply voltage, current of 3A, full indicator, simple circuitry, 14.1 volt output. Component : LM350, Transformer, bridge rectifier, capacitor, resistor, potentiometer, 1N4148 diode, BC558 transistor, 1N4001 diode, LED, LM1458. [sentex.ca]

Ultrasonic Range & Imager Circuit

Description : The following circuit is ultrasonic range and imager circuit. Feature : one piezoelectric tranducer for tramsmit & receive, range of 2.5m, high gain. Component : crystal, resistor, capacitor, 1N4149 diode, 1N4148 diode, BC557 transistor, BC549 transistor, BF245, 4016, PIC12C509. [ele.uva.es]