BUZ 73 L. V. 7 A. Ω. TO AB. CSA2. Maximum Ratings. Parameter. Symbol. Values. Unit. Continuous drain current. TC = 28 °C. ID. 7. A. BUZ73 from Motorola Solutions, Inc.. Find the PDF Datasheet, Specifications and Distributor Information. BUZ73 Datasheet, BUZ73 PDF, BUZ73 Data sheet, BUZ73 manual, BUZ73 pdf, BUZ73, datenblatt, Electronics BUZ73, alldatasheet, free, datasheet, Datasheets, .
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Dick Cappels’ project pages http: An ATtiny12 controller as a timer and some switching circuitry turns the doorbell off for 10 hours at the same time each day. The string of resistors across the top of the board are series connected to make a Ohm 2 watt resistor. The slide switch is used to switch the circuit between the test and operate modes and the large round component to the left of the switch is the 0. Download The assembly language source file is on this page. Overview This is a resettable timer and the to circuitry connect it to an 18V to 24V doorbell circuit.
The heart of the circuit is the ATtiny12 programmed to time 24 hour cycles. The circuit consists of a power supply, a capacitor back-up circuit, a Atmel ATtiny12 microcontroller as a timer, and solid state realy circuit to switch the AC voltage in the doorbell circuit. The simple user interface is comprised of a resync button to synchronize the timer, a bypass switch to bypass the timer if desired, and two status indicator LEDs. It is designed to be used by people who are not technically inclined.
The bell transformer, the doorbell button, and the doorbell are not in the enclosure – they are built into the house. The bypass switch and resync or reset button are mounted on the enclosure.
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For that reason, and my desire to not have to repair this once built and installed, I designed for relaibility, and this need is reflected throughout the design. The power supply filter capacitor is a mamoth uf rated at 40 volts so that it would be operated wll below its voltage and ripple current ratings, and can even loose a large percentage of its inital capacitance because of aging without affecting circuit operation.
This desire for reliability is also seen in the transient voltage protection in the solid state relay section of circuit and in the wiring of the board directly to the off-board switch and pushbutton rather than using connectors.
I suspect the IC socket is the weakest point in the design as far as reliabilty is concerned, and a socket was only used because this was a hand-wired prototype and changing the chip if it had been soldered directly into the board would have been a nightmare, and posed some electrostatic discharge challenges. While on the subject of electrostatic discharge and reliability, this is a good point to mention that the BUZ MOSFFET needs to be handled carefully in order to avoid damaging it or reducing its reliability through electrostatic discharge.
I dealt with this by shorting the gate, drain, and source leads with a small copper wire that remained in place until the part was completely mounted on the board. The assembly language source file is on this page. I am not one for fancy enclosures and would not have bothered with one for this circuit, but it is going to be mounted on the wall of my garage from many years of unattended operation, so I was concerned about protecting it and of course, that it is powered from the AC mains and fastened to the wall of my garage means that it will be in a metal box.
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The minibox is conveniently mounted in my garage next to the door datsheet the house. This makes it easy to change the timer’s cycle at any time by merely reaching up and pressing the button on the top of the box cover removed for the photograph. I really should staple the wire down someday.