Converter Cctv
July 14th, 2010
How do I prevent a voltage drop when powering 4 devices from one battery?
Hi there again,
I have made a circuit that consists of a 7.4V lipo being stepped down to 5V using a resistor in order for a DC-DC converter to step it up to 12V.
I have used a DC wire splitter used for CCTV cameras. It converts 1 DC output into 4 DC outputs. I am now getting 12V on all four outputs.
However my problem is that I am going to power a CCTV camera, transmitter and audio pre amp for the mic using up 3 of the 4 wires. But as soon as I connect the audio pre amp the voltage drops down to 8V on all four wires. I have already measured the current draw and it is only 20.5mA so I really dont know what is causing the voltage drop and how can I resolve it so that I get 12V on all 4 wires and solve the voltage drop? Thanks.
You may need a stronger current supply. Try increasing the value of the regulator capacitor. Use 18V + and higher microfarad capacitor and maybe as well as increase the value of the diodes. I have a power supply it reads 13v-15v with car stereo as load, but when I add an amp, it drops to say 10v, so I pulled out those transistors and do the basic full wave ckt and add an 20V and a higher capacitance condenser. Without load it reads 18V, and when everything is connected, it steadily reads at 13.5V.. just do trial and error.
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