A pair of heated motorcycle gloves were purchased from e bay for under £10, they originate in China so delivery takes some time, this is what they look like...........................
The gloves were supplied with cabling and an on/off switch but the plugs used were tiny and really not suitable for this purpose. The small plugs were removed from the gloves and replaced with standard 2.5mm coaxial dc types which of course means that the mating sockets must also be 2.5mm so the supplied leads and switch were discarded. The gloves operate from a 12v source and each draws a current of about 500mA making a total drain of 1A. The gloves were found to heat up quite rapidly when connected to the bike battery with the engine running as the voltage is about 13.5 volts but after a few minutes became too hot which is of course wasteful of power to say nothing of the discomfort to the hands. The answer is a pulsed power arrangement and I found that a duty cycle of about 2 to 1 was just right for most occasions. The battery interfacing and timer circuit are built into a small plastic box which can be seen in the pictures, the circuit for the Astable Multivibrator timer circuit is also shown below. The timer circuit delivers an "ON" time of about 60 seconds and an "OFF" time of about 30 seconds. The new glove connecting leads which have a 2.5mm plug at one end and a 2.5mm socket at the other are available on e bay and come in various lengths. When using the bikes own battery supply you will need an additional connecting lead with a 2.1mm dc plug on one end to connect to the control box and whatever plug/socket arrangement you decide on at the bike end, always make sure you have a suitable fuse at the bike end to avoid any problems, this should be no more than 5 Amps. It is inevitable that you may sometimes forget to unplug the lead from the bike when getting off so the plug and socket arrangement at the bike end should be a very flexible arrangement which easily disconnects when the lead is pulled preventing any mishaps. A separate battery can also be used but needs to be at least 6AH in capacity at 12 volts which will provide at least 2 hours of continuous operation, a modern lithium ion type is Ideal for this purpose and could be housed in a suitable waist bag. The pre set pot R2 is adjusted for the required "ON" time and R3 for the required "OFF" time, there is some interaction between these adjustments so some patience is needed to obtain the required timing parameters.
NB, It is VERY important that if you are using a separate battery held in a pocket or waist bag for this or any other purpose that nothing else is placed in that packet, eg keys or coins thus preventing the possibility of a short circuit which could result in overheating or fire, YOU HAVE BEEN WARNED...........
R1 680 ohm 0.25watt Resistor
R2 250 Kohm min Lin Pre Set Pot (see text)
R3 250 kohm min Lin Pre Set Pot (see text)
R4 2.2 Kohm 0.25watt Resistor
C1 2200 mfd 16v wkg Electrolytic Capacitor
C2 2200 mfd 16v wkg Electrolytic Capacitor
D1 BY127, 1N4001, 1N4148 or equiv Diode
D2 Red LED
FS1 4A Fuse (quick blow)
RL1 12v relay (min)
TR1 TIS90, BC108 or equiv npn Transistor
TR2 TIS90, BC108 or equiv npn Transistior
SKT1 2.5mm dc coaxial socket (chassis mounting)
SKT2 2.5mm dc coaxial socket (chassis mounting)
SKT3 2.1mm dc coaxial free plug on short connecting lead
Connecting leads are also required to connect the gloves to the control box and a lead from the control box to the bike supply if you are using it, see text.
NB, a resistor of about 10Kohms should be fitted in series with the pots R2 and R3 to prevent accidental damage to the transitors TR1 and TR2 should the pre set pots be turmed to their minimum resistance positions.
Below are the battery, control/interface box and glove connecting lead............