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Registered Member #9039
Joined: Wed Dec 26 2012, 03:31PM
Location: Epping, Victoria, Australia
Posts: 117
I have taken this circuit:
And re-designed it for 20V using Multisim:
I am looking particularly at the currents going through the bases of the various transistors and making sure they are about 20-25mA for the TIPs and about 10-15mA for the 2SC1518s
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
the values seem ok to me.
I would add a rectifier diode across each bridge transistor to protect against motor 'spikes' could be four diodes, or a bridge rectifier package
I am all for discrete designs (I have made a couple of discrete dc motor drivers for 'toy' robots), the best way to learn, by doing, and its your circuit, but you may also want to consider things like this probably cheaper than your parts :) but the heatsink is puny.
EDIT: poop ! ... the little pcb needs some modification to fit current-sense resistors.
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Opnion on this H bridge re-design for 20V rather than 12V please
