Friday, December 12, 2014
Battery Charger for NiCad Batt
This battery charger circuit is designed for recharging NiCad batteries based on an AC-powered current source method.It can crank out as much as 1 amp and can be modified to go even higher by choosing different devices for Q1. Since this circuit uses AC line voltages and currents, please exercise extreme caution during assembly, turn-on, and test.
Wireless Transmitter for IR Headphone
This circuit shows a Wireless Transmitter for IR Headphone.
Dual Voltage Inverter
This voltage inverter schematic can produce a dual (positive and negative) voltage from a single supply input.It is therefore extremely useful for powering opamp and other circuits that require a dual voltage from a single battery. The circuit will operate at an input voltage from around 5V to 20V and produce a output from +-2.5V to +-10V.
Thursday, December 11, 2014
Car Laptop Power Supply Adaptor
The laptop adaptor described here plugs into a car cigarette lighter socket and produces a 19V nominal output voltage adjustable by + - 0.5V. The input voltage range is from 9.2V to 15V and the output voltage shows good regulation even with large fluctuations of the input voltage.
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