Hi all
I was just wondering how those doorbells are made, where the button is wireless.
Or a system with say 2-4 buttons wireless?
I can think of all kind of complex solutions, but there must be a simple way - or chipset - for this
The receivers are COBs, xmitters are (cough) discreet.
I have a transmitter in front of me and it has at least one chip and what looks like a SAW device. The TX is discrete using one SM transistor.
The chip is a SM HT48RA0-2 8 bit MCU.
I'm adapting the doorbell to latch on and off an automatic antenna matching unit in a shed at the bottom of the garden. The unit is powered by solar panel & SLAB arrangement so I don't want it on all the time during the winter.
Charlie.
-- He who throws dirt loses ground.
What is COB short for? Google find e.g. corn when looking for COB
Chip On Board, the black blob things.
Also, discrete* (@ Bob). Discreet is when they're being very quiet. (See also: 'complimentary' pairs.)
Tim
-- Seven Transistor Labs Electrical Eng>> s>> > Hi all
chip on board , die directly on pcb with a blob of black goo on top
-Lasse
Cheap on board.
;-) ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Cost Of doing Business.
Black goo?
Usually a UV cure epoxy. Something which cures quickly to make produced goods able to be handled not long after application.
yes that is a very technical term for it ...
ofcourse, but unless you are going to make it at home in your kitchen that doesn't really matter
-Lasse
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