Greenwatts

LM339 Solar Tracker Circuit Parts List

Many of the components in the following parts list can be substituted with equivalent components such as using a AN6912 comparator instead of a LM339. We use 5mm clear green super bright LEDs with a 40deg viewing angle but any clear lens LED should work for the sensor. 1/4 or 1/2 watt resistors are adequate, fuses should be placed on each rail and a DPDT switch can be used also.

• U1/U2 - LM339 quad comarator
• Q1 - TIP42C Power Transistor
• Q2 - TIP41C Power Transistor
• Q3 - 2N3906 Transistor
• Q4 - 2N3904 Transistor
• R1 - 1meg ohm
• R2 - 1k ohm trim pot
• R3 - 10k ohm
• R4 - 10k ohm
• R5 - 10k ohm
• R6 - 4.7k ohm
• R7 - 2.7k ohm
• C1 - 10n ceramic capacitor
• M - DC motor up to 1amp
• LEDs - 5mm 563nm Hi Green Water Clear