Transmission ECU – More circuits (General purpose, PWM, heavy outputs)

The next step is our base circuits for the board. We have 4 General Purpose outputs, GPO1 – GP04 located to centre of the board. The Circuits GPO1 – GPO4 are made up from 1.0K Ohm, 1/8 Watt) in R13, R15, R17, R19 and 4 NPN in Q9, Q10, Q11, Q12



next we have our VB1, VB2, VB3, VB4 out put circuits. We begin by adding links to R5, R6, R7, R8. We are using 1.0K Ohm, 1/8 Watt resistors instad of wire links as we may want to scope these outputs at a later date.

Next we install and solder 30V Zener diodes {1N4751ADICT-ND} in D11, D12, D13, D14

To Complete the VB Circuits we install the Heatsink. we then Install and solder four large TO-220 size NPN transistors {RFP30N06LE-ND} in Q5, Q6, Q7, Q8 and insulators (under Q5, Q6, Q7, Q8){4724K-ND}) on the heat sink in positions. A liberal amount of heat sink grease is used :)


Next we have our PWM1, PWM2, PWM3, PWM4 Circuits. First we solder in our main jumpers in R1, R2, R3, and R4. In R9, R10, and R12 we use 1K ohm resistors and a wire jumper in r11


Install and solder 30V Zener Diodes {1N4751ADICT-ND}, D8, D9, D10. We then Install heatsink and solder 3 large TO-220 size NPN transistors {RFP30N06LE-ND} in Q1, Q2, Q4

We finish off the PWM circuits by installing and heatsinking a RFP30N06LE-ND into Q3




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