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DC to DC Converter mini Step up Voltage

Here is a DC to DC converter using a standard 12 VAC center tapped power transformer and a single bi-polar NPN transistor….

Here is a DC to DC converter using a standard 12 VAC center tapped power transformer and a single bi-polar NPN transistor. The circuit is not very efficient but will produce a high voltage usable for low power applications. The input battery voltage is raised by a factor of 10 across the transformer and further raised by a voltage tripler consisting of three capacitors and diodes connected to the high voltage side of the transformer. The circuit draws about 40 milliamps and should operate for about 200 hours on a couple of ‘D’ alkaline batteries. Higher voltages can be obtained by reducing the 4.7K bias resistor.

Original scheme edited by Bill Bowden, http://ourworld.compuserve.com/homepages/Bill_Bowden/

Be the first to comment - What do you think? Posted by admin - July 28, 2007 at 2:57 am

Categories: DC converter Tags: dc converter circuit, simple circuit, simple dc converter, step up dc converters

Simple DC Motor Control

circuit was built to operate a small motor used for opening and closing a pair of curtains. As an advantage over automatic closing and opening systems, you have control of how much, or how little light to let into a room.

The four diodes surriunding the motor, are back EMF diodes. They are chosen to suit the motor. For a 12V motor drawing 1amp under load, I use 1N4001 diodes.
The DC Motor control Kit

Source :: http://www.zen22142.zen.co.uk/Circuits/Switching/

Be the first to comment - What do you think? Posted by admin - June 1, 2007 at 2:03 am

Categories: Basic electronics, Electronic Control, Motor controller Tags: DC motor controller, Motor controller, simple circuit

Simple Timer by CA3140 + NE555

This be the circuit sets the time to model is simple,at can fix the time had long ago and have tall good accuracy. By use pillar equipment be IC CA3140 for fix time mouth and NE555 perform sound electric bell origin. By we can fine time value done to a turn VR1 can fine since 10 second arrive at 3 hour. When the time expires will have an electric bell that a loudspeaker. For the equipment that should choose specially. Be C1 100uF 16V values should are a kind Tantalum. Because tall quality more Electrolytic. The moderately but if no enough replace can sir. Request friends have fun the circuit sets the time this please sir.