musicman282
Active member
The H-bridge motor drive board in my Red and Ted's roadshow wasn't properly driving Red's mouth. I suspected it was bad transistors in the H-drive circuit. I replaced the TIP102 and TIP107s and the motor would hardly move. It would just click for open and click for close. I tested the motor on the circuit for TED to rule out a bad motor and the motor works strong as can be.
I spent a ton of time double checking the connections and my soldering and scoping the circuit. Luckily the board has two identical H-bridge circuits so I can compare the two with my scope. I narrowed it down to low voltage coming off the emmiter of the new TIP 107!!
Well out of curiousity, I swapped the TIP107's from the TED circuit over to the RED circuit and volia!! RED's mouth works perfect. So my question is, are there differences in tip107's? I poured over the datasheet and couldn't find any differences between all the models offered on digikey.
Does anyone know the exact specs of the TIP107's used in this circuit?
Any help would be greatly appreciated. I'm planning on ordering some more transistors from mouser this time to make sure they're from a different batch in case I just got some bum parts.
I spent a ton of time double checking the connections and my soldering and scoping the circuit. Luckily the board has two identical H-bridge circuits so I can compare the two with my scope. I narrowed it down to low voltage coming off the emmiter of the new TIP 107!!
Well out of curiousity, I swapped the TIP107's from the TED circuit over to the RED circuit and volia!! RED's mouth works perfect. So my question is, are there differences in tip107's? I poured over the datasheet and couldn't find any differences between all the models offered on digikey.
Does anyone know the exact specs of the TIP107's used in this circuit?
Any help would be greatly appreciated. I'm planning on ordering some more transistors from mouser this time to make sure they're from a different batch in case I just got some bum parts.