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Selecting a Switch There are three important features to consider when selecting a switch: Contacts  (e.g. single pole, double throw) Ratings  (maximum voltage and current) Method of Operation  (toggle, slide, key etc.) Switch Contacts Several terms are used to describe switch contacts: Pole  - number of switch contact sets. Throw  - number of conducting positions, single or double. Way  - number of conducting positions, three or more. Momentary  - switch returns to its normal position when released. Open  - off position, contacts not conducting. Closed  - on position, contacts conducting, there may be several on positions. For example: the simplest on-off switch has one set of contacts (single pole) and one switching position which conducts (single throw). The switch mechanism has two positions: open (off) and closed (on), but it is called 'single throw' because only one position conducts. Switch Contact Ratings Switch contacts are rated wit...

TOUCH SWITCH 1 This circuit detects the skin resistance of a finger to deliver a awfully tiny current to the super-alpha try of transistors to show the circuit ON. The output of the "super transistor" activates the BC 557 transistor. The voltage on the highest of the world is passed to the front of the circuit via the 4M7 to require the place of your finger and also the circuit remains ON.  To turn the circuit OFF, a finger on the OFF pads can activate the primary transistor and this may rob the "super transistor" of voltage and also the circuit can close up. TOUCH SWITCH-2 This circuit detects the skin resistance of a finger to show the circuit ON for concerning one second. The output are often taken to a counting circuit. The circuit consumes no current when in quiescent mode:

Trick jumper switches on the mobile phone antenna this will affect the capability dual-band mobile phone into one band only, ie 900 MHz. This trick is very useful to get around the limitations of funds. If you do not want to lose the ability to dual-band mobile phone into one band only, then the alternative is to make the turn with a new IC PA. ANTENNA JUMPER DIAGRAM MMI strives to provide complete and accurate information, but MMI is not responsible for any errors / damage that occurs in the use of information we provide.   Noki GAGE QD Nokia 90 Nokia 6070