Alarm Circuit for 5 Zone Alarm system

5 Zone Alarm Circuit
My advice is to print off a copy of the schematic then to systematically list all components of one type. Start with resistors, write down their values from the schematic and place a pencil mark against the component on the schematic. Repeat until all components have been ticked. So reading from the schematic:

Capacitors.

The capacitor's function is to store electricity, or electrical energy.
The capacitor also functions as a filter, passing alternating current (AC), and blocking direct current (DC).
This symbol is used to indicate a capacitor in a circuit diagram.

The capacitor is constructed with two electrode plates facing eachother, but separated by an insulator.

When DC voltage is applied to the capacitor, an electric charge is stored on each electrode. While the capacitor is charging up, current flows. The current will stop flowing when the capacitor has fully charged.

When a circuit tester, such as an analog meter set to measure resistance, is connected to a 10 microfarad (µF) electrolytic capacitor, a current will flow, but only for a moment. You can confirm that the meter's needle moves off of zero, but returns to zero right away.
When you connect the meter's probes to the capacitor in reverse, you will note that current once again flows for a moment. Once again, when the capacitor has fully charged, the current stops flowing. So the capacitor can be used as a filter that blocks DC current. (A "DC cut" filter.)
However, in the case of alternating current, the current will be allowed to pass. Alternating current is similar to repeatedly switching the test meter's probes back and forth on the capacitor. Current flows every time the probes are switched.

Full duplex Intercom circuits

P1_____________22K  Log. Potentiometer

R1_____________22K  1/4W Resistor
R2,R3_________100K  1/4W Resistors
R4_____________47K  1/4W Resistor
R5______________2K2 1/4W Resistor (See Notes)
R6______________6K8 1/4W Resistor
R7_____________22K  1/2W Carbon or Cermet Trimmer
R8______________2K7 1/4W Resistor

C1,C6_________100nF  63V Polyester or Ceramic Capacitors
C2,C3__________10µF  63V Electrolytic Capacitors
C4_____________22µF  25V Electrolytic Capacitor
C5_____________22nF  63V Polyester or Ceramic Capacitor
C7____________470µF  25V Electrolytic Capacitor

Q1____________BC547  45V 100mA NPN Transistor

IC1_________TDA7052  Audio power amplifier IC

SW1____________SPST  miniature Switch

MIC____________Miniature electret microphone

SPKR___________8 Ohm Loudspeaker

Screened cable used

60W MosFet Audio Amplifier Circuits.

 Parts List

R1______________47K   1/4W Resistor
R2_______________4K7  1/4W Resistor
R3______________22K   1/4W Resistor
R4_______________1K   1/4W Resistor
R5,R12,R13_____330R   1/4W Resistors
R6_______________1K5  1/4W Resistor
R7______________15K   1/4W Resistor
R8______________33K   1/4W Resistor
R9_____________150K   1/4W Resistor
R10____________500R   1/2W Trimmer Cermet
R11_____________39R   1/4W Resistor
R14,R15___________R33 2.5W Resistors
R16_____________10R   2.5W Resistor
R17_______________R22   5W Resistor (wirewound)

C1_____________470nF   63V Polyester Capacitor
C2_____________470pF   63V Polystyrene or ceramic Capacitor
C3______________47µF   63V Electrolytic Capacitor
C4,C8,C9,C11___100nF   63V Polyester Capacitors
C5______________10pF   63V Polystyrene or ceramic Capacitor
C6_______________1µF   63V Polyester Capacitor
C7,C10_________100µF   63V Electrolytic Capacitors

D1___________1N4002   100V 1A Diode
D2_____________5mm. Red LED

Q1,Q2,Q4_____MPSA43   200V 500mA NPN Transistors
Q3,Q5________BC546     65V 100mA NPN Transistors
Q6___________MJE340   200V 500mA NPN Transistor
Q7___________MJE350   200V 500mA PNP Transistor
Q8___________IRFP240  200V 20A N-Channel Hexfet Transistor
Q9___________IRFP9240 200V 12A P-Channel Hexfet Transistor

STK465 Stereo Power Amplifier circuit

 STK465 - 30 watt Stereo Power Amplifier

STK465 - 30 watt Stereo Power Amplifier

Source: http://sharingmanual.blogspot.com/2012/08/stk465-30-watt-stereo-power-amplifier.html

Completed STK465 is an amplifier of acoustic frequencies that offers qualitative output, using minimal exterior elements. Substantially he is one of big completed force. When it functions with tendency 56V then the tendency will be ± 28V as for the ground. With this recommended tendency of catering, the attributed force is 30 WRMS in charge 8 Ohm.

 

Power Failure Alarm circuit

Description:
This is a very basic alarm designed to let you know when the electricity supply fails. The alarm is powered from a battery which uses no current consumption at all in standby, a battery should therefore last its full shelf life. In use, as long as the electric supply is healthy, relay RLY1 remains energized. Under this (standby) condition, the relay contacts are open and the buzzer will not sound. The battery drain is zero and should last its full shelf life of 2 years or more.

Should the power fail, the relay de-energizes, its contacts close and the alarm is sounded. BZ1 is the audible device and can be a loud piezo type sounder,bell or buzzer. The battery should be chosen to match the sounders operating voltage.
Although drawn with a full power supply; (transformer, bridge rectifier and smoothing capacitor) this can be substituted with a readily available DC adapter. In this case just chose a relay whose operating voltage matches the adapter.
Once power fails, there is no way to stop the sounder, this is why switch S1 is in circuit, to mute the alarm. Electronics Circuit Application

Motorcycle Alarm Circuit

Circuit Notes

Any number of normally open switches may be used. Fit the mercury switches so that they close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to protect removable panels and the lids of panniers etc. While at least one switch remains closed, the siren will sound. About two minutes after the switches have been opened again, the alarm will reset. How long it takes to switch off depends on the characteristics of the actual components used. But, up to a point, you can adjust the time to suit your requirements by changing the value of C1.

The circuit board and switches must be protected from the elements. Dampness or condensation will cause malfunction. Without its terminal blocks, the board is small. Ideally, you should try to find a siren with enough spare space inside to accommodate it. Fit a 1-amp in-line fuse close to the power source. This protects the wiring. Instead of using a key-switch you can use a hidden switch; or you could use the normally closed contacts of a small relay. Wire the relay coil so that it is energized while the ignition is on. Then every time you turn the ignition off, the alarm will set itself.

When it's not sounding, the circuit uses virtually no current. This should make it useful in other circumstances. For example, powered by dry batteries and with the relay and siren voltages to suit, it could be fitted inside a computer or anything else that's in danger of being picked up and carried away. The low standby current and automatic reset means that for this sort of application an external on/off switch may not be necessary. Electronics Circuit Application