Brief Introduction

In this project, we are going to come up with an electrical circuit that will be used in the charging of the 12V battery. The schematic will have voltage and current monitoring measures to ensure that we have a perfect system that can tell the user what is the level of the charging voltage and currents.

The Circuit

Our system circuit is based on the MC78L12-SO8 IC which is a product manufactured by Freescale. This IC is just a 7812 IC with the ability to offer an output of 3A. The transformer T1 does the voltage step-down function while the diodes D1 and D2 execute the rectification purpose. Capacitor C1 is a filter while C2 is a decoupling capacitor. Diode D3, D4, and D5 lift the grounding of IC U1 to 2.1 volts and this makes the U1 IC output to be 14.1V which is 12V + 2.1V. We have introduced diode D6 to protect the reverse flow of the current from the battery when the mains are not available. MES1 shows the charging current while MES2 shows the charging voltage.

The Circuit above can be drawn using KiCAD EDA. The circuit can also be converted to a 3D view using the same KiCAD. This will involve routing. The final product is attached below where the upper side is all other components and the lower side is the transformer.

Assembling of the Product

I ordered the product assembly through PCBway. The assembly process in PCBway is the best for many clients as they consider your satisfaction their priority.

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3. Combo; In this PCBway supplies some parts as the client supplies others.

Select any of the three assembly services available, fill in the relevant information, calculate then submit your order to the team of engineers for final quote determination. When you receive the final quote, pay using the available payment methods, then sit back and wait for the delivery of your product in 7 days.