QT4022

• https://www.eevblog.com/forum/beginners/resistance-across-dc-input
• https://blog.jj5.net/blog/2023/08/22/philips-qt4022/

Photos

Board and battery

Solder tab

Motor

Motor is a FF-180SH-2661.

See FF-180PH-2290/2661/2852 precious metal brush micro motor DC 2.4V 3.7V 5V mute shaver motor 2mm Shaft DIY Toy Car.

Motor specification

Brand	Mabuchi Motor
Model	180 precious metal brush micro motor
Motor specifications	32 * 20.5 * 15.5mm (length * width * height);
Shaft length	8.4 mm;
Shaft diameter	2 mm;
Weight	32 grams;
Applicable voltage	DC 2.4-6 volts;

Model: FF-180SH-2661:
Voltage: DC 2.4 V, no-load current: 120 mA, blocked current 1.8 A, no-load speed: 6710 rpm
Voltage: DC 3 volts, no-load current: 140 mA, locked rotor current 3.2 amps, no-load speed: 8675 rpm / min;
Voltage: DC 4.5 volts, no-load current: 140 mA, blocked current 4.8 amps, no-load speed: 13326 rpm;
Voltage: DC 5 volts, no-load current: 140 mA, locked rotor current> 5 amps, no-load speed: 14270 rpm