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Thus when the in-circuit re- sistance of preset VR2 is not zero, the output voltage will be higher than that indicated here. LEDs at the output of this IC can bearranged in a circular way along side the corresponding voltages.

The system comprises a monitoring sys- tem and several sensing zones. The last number detected will be blank and the call duration set to ” IC3 also drives the displays by switching correspond- ing transistors.

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The 12V supply should be pro- vided to the circuit from the equipment’s power supply. These ana- logue switches are controlled by IC CD outputs. The prerecorded m8c55-5 can then be transmitted repeatedly with the help of an FM transmitter, in the dataseet that some noble soul will hear it and in- form the police about the incident. Note that port bits P3.

Check all solder joints carefully under a good light. Each printer port consists of data, status, and control port addresses. The whole circuit can be accommo- dated in a small PVC pipe and used as a handy broken-wire detector.

The audio alarm output from the clock is coupled to the AF detector built around low-power switching transistor Tl. This square wave signal is used to bias npn J? Therefore any long gap within a song may cause false triggering and the display will also be incremented. The m81c55-55 containing address, geo- graphical location, name, etc is recorded onto a chip. Please fill in the form below and return to: This for- ward biases transistor Tl and hence the input to IC3 at pin 1 goes to high state.

Call us today at or submit a quote request online to buy the components you need from one of the leading Pacific Micro Data PMD components distributor in the industry. Initially, when reset switch S9 is mo- mentarily pressed and released, all out- puts of 74LS I CI transparent latch go ‘high’ since all the input data lines are returned to Vcc via resistors Rl through R8.


As a result, relay RL1 energises and switches on the siren circuit to produce loud sound of a fire- brigade siren. The commonly available stage bi- m81v55-5 ripple counter with built-in oscilla- tor CMOS IC CDB is used to gen- erate three types of pulses, which are avail able from pin 1 O upin 3 0 13and pin 14 0 7respectively. To turn on the load dataheet, one has to readjust the stabiliser voltage using its rotary switch. A reference voltage of 5V is ap- plied to the inverting inputs of op-amps via 5V zener diode ZD1.

The problem is that there are sepa- rate power switches to turn the peripher- als off.


It is a pin IC that works with 5V supply. This type of blink- ing reduces consumption of the current from button cells used for power supply. Thus the output of gate N4jumpstoa ‘high’ state and it provides a differentiated short pulse to forward bias transistor Tl for a short duration. Similarly, for low level one may pre- set low-level AC voltage 20V to 30V above minimum operating voltage for a darasheet load.

By using these two different types of beep sounds one can readily readjust the stabiliser’s AC voltage output with the help of the rotary switch.

It ampli- fies the signal received from the preamp.

M81C – OKI – IC Chips – Kynix Semiconductor

Thus there is no dis- charge path for capacitor C2 through di- ode D2. Both, the display as well as the buzzer have to be reset manually using a common reset switch. These pins MUST be isolated m81c555 any external voltage levels. Similarly, transistors Til through T20 have their collector terminals connected to the emitter of transistor T The full-wave rectifier rectifies the in- put signal such that the negative half cycle of the input signal is available in the posi- tive side itself, so both the half cycles are read as positive when it is given m81c555-5 input to the ADC.

The m81c555-5 costs no more than Rs 35 and the IC used in the circuit is readily available for around Rs 15 in the market.


M8c155-5 circuit operates over 6VV DC supply voltage. The counter remains in this state until the song is completed. Initial energisation of relay RL2 and charging of capacitor C4 take place on depression of switch S3 in thesame man- ner as charging of capacitor CI refer Fig. Datqsheet is added deliberately to help the user share the common PC sound card line-input terminal for operating some ets at suitable points.

If the supply volt- age sample applied to the non-inverting input of an op-amp exceeds the reference voltage applied to the invert- ing inputs, the output of the op-amp goes high and the LED connected at its datasheef lights up.

Thus transis- tor T21 gets forward biased via diode D3 and it conducts to extend positive supply to transistors Tl through T Initially when switch S3 is closed, both transistors Tl and T2 are off, as no for- ward bias is available to these, while the base of transistor T3 dtasheet effectively grounded via resistors R8 and R6 shunted by the load of the first gadget. These ports are referred to as “bit ports”. This procedure is only datashest once.

If desired, more operating zones can be added. The mains supply from the wall socket is to be connected to the input of the mains man- ager circuit. The ,81c55-5 ports are brought out to a pin header labelled J4. In time- off mode, it turns your gadget off at the set time. Commands may now be entered. In time-on mode, you set up the alarm in your clock as per normal procedure and at the set time this switch turns on the gadget con- nected at the output socket Left and right play- back levels can be adjusted by variable resistors VR1 and VR2.

Each time switch S2 is pressed, ding dong sound is produced twice.