Thanks you again!
The TIP120 is not used as an amplifier but as a saturated switch.
DC gain is irrelevant here.
Look at page 6, fig. 10 right: VCE(sat) @ IC/IB = 250
Q: So the links I've provided before (video + link to pipo's answer) are wrong?
Keep in mind that I still have a lot to learn, using referrences from the diagram will work best for me (rather then "diode across a TIP120") .
In the diagram you still have one diode across a TIP120.
If you refer to D2-D9.. this is what you and @larryd advices me to do (I turned it around).
Then I added the cap like you and @PaulRB suggested...
Q: should I remove it and keep the cap only?
keep the TPIC6B595
But it's max current is 250mA and the motor Inush is around 250mA-300mA.
Q: It won't get damaged?
Q: What about mixing it with @wvmarle's suggestion?
- Have a 12v-5v buck + 5v-3.3v buck (or a volt regulator)
- Use TPIC6B595 (or SN74HC595) and IRL44N
The price will go up $3 (additional Buck and TPIC6B959), but It will make the design more flexible:
- Capable of handling >250mA motors
- Controllers of 5v/3v can be used.
- Motors can run parallel if needed (limited only by the max current of the VCC).
Q: What do you think, is it a good idea (with SN74HC594 or TPIC6595)?