Hey stumbled on this great forum after searching for this topic, but can't find an exact answer for my question (with schematic if possible!).
I have been looking at the circuit shown here:
**broken link removed**
I will be driving two motors from a typical R/C car supplied with 9.6V NiCad (I assume they'll draw about 1 amp).
But currently have the following items which differ slightly from those ones (sorry my part numbers might be different as I'm from Australia ) :
From my reading on the theory of H-Bridges these should be fine, as the Rds(ON) is about the same for both MOSFETS (approx .1 Ω), and they're both logic level driven (I hope i read the datasheets correctly).
My question is do I need the transistors at all because I have logic level MOSFETS?
And can I drive this with two PWM signals as the MCU I'm using (from an autopilot) doesn't have plain digital I/O!! Otherwise I have 8 PWM signals (max) and I can just have them fully on and act like digital outputs, but I'm a little uncertain because I don't think I can fully turn them off (as they're meant to drive servo motors the only settings I have are: min="1000" neutral="1000" max="2000" which are in ms).
Hopefully that all made sense, as I'm quite an amateur!!!
Thanks for your time.
I have been looking at the circuit shown here:
**broken link removed**
I will be driving two motors from a typical R/C car supplied with 9.6V NiCad (I assume they'll draw about 1 amp).
But currently have the following items which differ slightly from those ones (sorry my part numbers might be different as I'm from Australia ) :
- NPN = 2N3904
- PNP = BC558 (general purpose PNP)
- N-Channel MOSFET = MPT3055
- P-Channel MOSFET = IRF9540N
From my reading on the theory of H-Bridges these should be fine, as the Rds(ON) is about the same for both MOSFETS (approx .1 Ω), and they're both logic level driven (I hope i read the datasheets correctly).
My question is do I need the transistors at all because I have logic level MOSFETS?
And can I drive this with two PWM signals as the MCU I'm using (from an autopilot) doesn't have plain digital I/O!! Otherwise I have 8 PWM signals (max) and I can just have them fully on and act like digital outputs, but I'm a little uncertain because I don't think I can fully turn them off (as they're meant to drive servo motors the only settings I have are: min="1000" neutral="1000" max="2000" which are in ms).
Hopefully that all made sense, as I'm quite an amateur!!!
Thanks for your time.