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Dual USB Charger With Switching Regulator
Posted on Tuesday, October 19, 2010   •   Category: Battery Chargers


This is a portable USB Charger. It uses a high efficiency switching regulator that runs at 85 - 94% efficiency depending on input voltage and load. It takes an input voltage from 8 to 16 volts and can run from anything from a 9 volt battery to a car battery. It has 2 USB ports and easily charges 2 power hungry devices at once.


VHF Video Transmitter 60-200 MHz
Posted on Tuesday, October 19, 2010   •   Category: Video


Here's a simple video transmitter for VHF TV channel will accept baseband video input, hence it can be driven by most CCD cameras and VCR video outputs. It ouputs roughly 80mW and when used with a 40cm telescopic antenna over 100 meters range is possible.


6 Channel Audio Mixer
Posted on Tuesday, October 19, 2010   •   Category: Amplifiers


The mixer circuit below has 3 line inputs and 3 mic inputs. The mic inputs are suitable for low impedance 200-1000R dynamic microphones. An ECM or condenser mic can also be used, but must have bias applied via a series resistor.


5 - 30 Minute Timer
Posted on Tuesday, October 19, 2010   •   Category: Miscellaneous


A switched timer for intervals of 5 to 30 minutes incremented in 5 minute steps. Simple to build, simple to make, nothing too complicated here. However you must use the CMOS type 555 timer designated the 7555, a normal 555 timer will not work here due to the resistor values. Also a low leakage type capacitor must be used for C1, and I would strongly suggest a Tantalum Bead type.


Sound Operated Switch
Posted on Tuesday, October 19, 2010   •   Category: Miscellaneous


This sensitive sound operated switch can be used with a dynamic microphone insert as above, or be used with an electric (ECM) microphone.


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