1. A portable lighting system comprising:
a light comprising
at least one light emitting diode (LED);
at least one battery;
circuitry connecting said at least one LED to said at least one battery;
a magnet switch interposed in the circuitry;
a manual switch interposed in the circuitry, the switch having a first position and a second position;
an enclosure surrounding the at least LED, the circuitry, the magnetic switch, and the manual switch;
a sealing means to prevent moisture intrusion into the enclosure;
and a means for mounting said enclosure to a surface;
a magnet with a means for mounting the magnet to a surface, the magnet being positioned in proximity to the light;
wherein the at least one battery, magnetic switch, manual switch, circuitry and at least one LED are arranged and connected in a manner such that when the magnet is removed from proximity to the light, and said manual switch is in a first position circuitry connects power from said at least one battery to said at least one LED.
2. The system of claim 1 wherein said mounting means of said light is a removable means.
3. The system of claim 1 wherein said light further comprises a means for controlling the dispersion of light from said at least one LED.
4. The system of claim 3 wherein said means comprises a reflector.
5. The system of claim 3 wherein said means comprises a lens.
6. The system of claim 3 wherein said means is demountable.
7. The system of claim 6 wherein said means comprises a reflector.
8. The system of claim 6 wherein said means comprises a lens.
9. The system of claim 1 wherein said manual switch comprises a magnet.
10. The system of claim 2 wherein said mounting means of said light comprises hook and loop fasteners.
11. The system of claim 1 wherein said at least one battery is replaceable.
12. The system of claim 1 wherein said at least one battery is not replaceable.
13. The system of claim 1 wherein said light has a one LED.
14. The system of claim 1 wherein said light has multiple LEDs.
15. The system of claim 2 further comprising an additional mounting means which can be removably mounted to an article of clothing or an object such that said light can be removably mounted to said article of clothing or object.
16. The system of claim 15 wherein said additional mounting means is a hook and loop fastener.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A mixer, comprising:
first and second MOSFETs having source terminals coupled together;
a first input MOSFET coupled to the source terminals of the first and second MOSFETs to operate as a first bias current sink for the first and second MOSFETs and coupled to receive a first leg of a small differential signal input;
third and fourth MOSFETs having source terminals coupled together wherein the drain terminals of the first and third MOSFETs are coupled together to provide a first leg of a differential output of the mixer and the drain terminals of the second and fourth MOSFETs are coupled together to provide a second leg of the differential output;
a second input MOSFET coupled to the source terminals of the third and fourth MOSFETs to operate as a second bias current sink for the third and fourth MOSFETs and coupled to receive a second leg of the small differential signal input;
wherein the first and fourth MOSFETs have gate terminals operatively coupled to receive a first leg of a large signal differential input;
wherein the second and third MOSFETs have gate terminals operatively coupled to receive a second leg of a large signal differential input;
at least one current source; and
first and second coupling MOSFETs operably coupled to the at least one current source and to the first and second input MOSFETs, respectively, to substantially source the first and second bias currents when the large signal differential input approaches an alternating current zero-crossing point, the first and second coupling MOSFETs further coupled to receive, at a gate terminal of each of the first and second coupling MOSFETs, a signal from the source terminals of the third and fourth MOSFETs and the first and second MOSFETs, respectively, to operationally bias the first and second coupling MOSFETs.
2. The mixer of claim 1 wherein the at least one current source consists of one current source wherein the coupling circuitry couples the one current source to each of the first and second bias current sinks.
3. The mixer of claim 1 wherein the at least one current source comprises a resistor coupled to a supply voltage.
4. The mixer of claim 1 wherein the at least one current source comprises a MOSFET coupled and biased to act as a resistor coupled to a supply voltage.
5. The mixer of claim 1 wherein the at least one current source comprises two current sources for sourcing current approximately at a zero-crossing wherein a first of the two current sources substantially sources current for the first bias current sink and wherein a second of the two current sources substantially sources current for the second bias current sink.
6. The mixer of claim 5 wherein the at least one current source comprises two resistors coupled to a supply voltage.
7. The mixer of claim 5 wherein the at least one current source comprises two MOSFETs coupled and biased to act as resistors coupled to a supply voltage.
8. The mixer of claim 1 wherein the coupling circuitry comprises at least one coupling MOSFET.
9. The mixer of claim 8 wherein each MOSFET of the at least one coupling MOSFET comprises a p-channel MOSFET.
10. The mixer of claim 5 wherein the coupling circuitry comprises at least two p-channel coupling MOSFETs, each having a gate terminal coupled to receive a bias signal that operably biases the p-channel MOSFET as the large signal differential input approaches a zero-crossing.