Got Hot Milk?

By Design News Staff -- Design News, September 5, 2005

Raising your kids on "nature's best" milk presents all sorts of logistical issues for a stay-at-home dad. Even a trip to the grocery store is fraught with peril, as a commercial bottle warmer takes way too long (15 minutes) with two screaming kids in the car. Calculating that he needed about 200W for two minutes to heat a bottle of milk, Michael built a small "low drop out," high-current linear voltage circuit to regulate the voltage of a 20V battery pack (borrowed from a cordless drill) that powers his warmer.

"The Pacifier" Baby Bottle Warmer Parts List
Amt	Part Description	Allied Part #
1	Voltage regulator	773-0123
1	Op amp	630-0028
1	P-Channel FET	307-0191
1	FET heat sink	619-0021
1	FET mounting kit	619-4881
1	2 pin plug housing	863-0311
1	2 pin receptacle housing	863-0316
2	male pins for receptacle housing	863-0395
2	female pins for plug housing	863-0391
3	100K, 1/4W resistor	832-0717
1	22K, 1/4W resistor	832-0585
1	1K, 1/4W resistor	832-0356
1	100 V, 1/4W resistor	832-0202
1	100 µF capacitor	881-7190
1	47 µF capacitor	852-6558
Additional parts required: Bottle warmer; Inverter—400W (800W peak), VEC024M; 18V Cordless drill battery and charger; Proto Board; Wire—Red, Black, Yellow 16 gauge; 1 1.0 µF capacitor; 1 0.33 µF capacitor; 1 3.3 µF capacitor; 2 Ring terminals.

Read and download the detailed documentation on how to

create a lightweight, portable unit for warming a baby’s bottle.

Download Detailed Bottle Warmer Parts List

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