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And here is the circuit as PDF. The vero board was 50 x 45 mm section of a larger board with 23 x 7 mm cutout on one corner to fit next to one of the motors. A layout diagram would be something I'd consider if anyone is seriously interested in copying this.
Bluetooth module from ebay US$19.99 (~A$30)
Other parts from Jaycar:
Vero board $3.80
Voltage reg LM723CN $1.70
Dual op-amp LM358 $1.50
IC sockets $1.70
Resistors $2
Capacitor $0.30
USB plug & socket $4.05
Total: a bit under $45
I think that's the lot, without counting hookup wire which is about $5/roll.
;-)
Mick
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