Alkaline 9V battery ~ 550mAh
Carbon-Zinc 9V battery ~400mAh

Standby time of circuit 10hrs
Voltage at end of standby ~8.5V



Quiescent Current <=3.1mA

Balancing voltage: 0.56-0.58V on inverting input
Resistance @balance: 700+ ohms

On to Off: ~15 turns of 4.8k pot




Bill of Materials:

B1	2x AA "SUPER" batteries
B2	9V Eveready battery
M	Tamyia Motor (blue)
Q1	IRF510
R1	10k
R2	4.8k variable	
R3	10k	
U1	RC5534 DIP-8




Cost:

RC5534		$2.30
IRF510		$3.00
9V Battery x1	$2.50
AA Battery x2	$1.00
Resistors	$1.20
Switch		$2.80
Battery Holder	$0.50
________________
Total cost $13.30