# Circuit for 220 volt to 12 Volt DC Power Supply without Transformer

In this tutorial we are going to learn about Circuit for 220 volt to 12 Volt DC Power Supply without Transformer

Circuit for 220 volt to 12 Volt DC Power Supply without Transformer

As per circuit we are taking first BOM which are required for Circuit for 220 volt to 12 Volt DC Power Supply without Transformer

Below BOM for Circuit for 220 volt to 12 Volt DC Power Supply without Transformer

No. Qty Location Part No. Description
1 1 C1 155k400V (Non Polarized, Polyester Film Capacitor)
2 1 C2 47UF/50V (Electrolyte Capacitor)
3 1 D1 KBL406 ( 50V, 4A bridge rectifier)
4 1 J1 AC220V (Molex 5MM connector)
5 1 J2 12V DC (Molex 3MM connector)
6 2 R1R3 560K/1/4W (Normal resistor 1/4W)
7 1 R2 1E/1W (Normal resistor 1W)
8 1 R4 2.2E/1W (Normal resistor 1W)

Construction of 220 volt to 12 Volt DC Power Supply without Transformer

As per circuit diagram we can see first AC input connector J1 which are connected with 1E/1W resistor in series after that same net connected series in C1 400v Poly film capacitor which have 560K resistor in parallel, that is connected in input AC bridge terminal and second connection of AC terminal of Bridge are connected to AC input direct , Output of bridge direct connected to parallel with C2 (47U/50V) which have parallel resistor R3 of 560K, and negative terminal of capacitor are connected in series 2.2E/1 watt resistor and that connected to negative terminal of 12V negative output and positive terminal of C2 direct connected to output load of 12V positive terminal. Now become complete circuit of 220 volt to 12 Volt DC Power Supply without Transformer.

Working of Circuit for 220 volt to 12 Volt DC Power Supply without Transformer

First we will check all components value should be matched with our BOM then we have confirmed BOM is okay then check circuit , now we will see how it will work first we need the 220VAC power supply which we can take normal power plug at home, Now when switch on AC then AC supply first goes to polyfilm capacitor through 1E resistor which control the AC that are connected to bridge and will get bridge output DC that will get at electrolyte that negative terminal are connected to 1E/1W resistance that control the output load.

PCB Design for 220 volt to 12 Volt DC Power Supply without Transformer

As per PCB design of 220 volt to 12 Volt DC Power Supply without Transformer, we see all components arrange as per flow of circuit when we design any types of PCB, then first arrange the components as per flow of circuit then PCB will be design best as well as which we would like to do , here can see all trace is clear with connected to each connection properly, AC power section is separated to DC section because it can be disturb to low signal components .
Below is arrangement of PCB design.

1. Input connector 220V AC supply –J1
2. Bridge Rectifier D1
3. Output electrolyte capacitor C2
4. Output Load Connector J2