The wattmeter is a very easy to build instrument. The user could start to sold the resistors and capacitors not polarized. The next step are the ICs sockets and the connectors (also the dual strip for LCD display). The last components are the current sensor, the electrolitycs capacitors and the voltage regulator. The LCD driver is mounted just under the LCD display.The PCB dimensions are intended to fit the circuit in a TEKO enclosure, code TENCLOS B 880-B .9 or similar (there are different codes for similar enclosures that differs only in height). The polarized components are marked as follows:

1. The 1N4148 has the catode (black band) to the PCB edge.
2. The LM78L05 has the flat face to the PCB center.
3. The integrated circuits have the pin 1 octagonal or square.
4. The polarized capacitors positive is shown in the assembly image.

The PCB for Wattmeter is available. Contact us for more details.