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Power supply circuit and PCB design needed  

Power supply circuit and PCB design needed is project number 265673
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Status:

Selected Providers: prognoz1

Budget: $30-250

Created: 05/23/2008 at 7:31 EDT

Bid Count: 13

Average Bid:
N/A

06/06/2008 at 7:31 EDT

Project Creator: ukco
Employer Rating: 10/1010/1010/1010/1010/1010/1010/1010/1010/1010/10 (1 reviews)

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Description

We need a circuit and PCB design for a 5 volt power supply with a battery charge and supply circuit to provide power when the input voltage fails. In effect this is a small simple 5 volt UPS, without any fancy "on battery" or "supply fail" outputs other than a couple of LED indicators.

The battery circuit must disconnect the battery at a defined voltage to prevent full discharge and cell damage when using a sealed lead acid battery and it must also prevent overcharge of the cell.

The 5 volt output must have a timer, so that the supply will only switch on 30 seconds after power is supplied to the input.

Input range 12 to 48 volts.
Output 5 volts @ 1 or 2 amps.

Battery is to be connected externally, voltage and capacity variable depending on desired run time.

The overall purpose is to produce a small, robust and cheap device.

Deliverables are:
1. Circuit design
2. Gerber, solder resist, component layout and drill files to manufacture PCB
3. Parts list
4. Sample PCB for test.

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