Thursday, August 1, 2013
Analog Signal Transmission Circuit Through DC Supply Line
If the sensor system need an active supply, we can use only a single pair of cable to carry both the power supply and the output signal. Not only simplify the wiring, converting analog voltage level to frequency modulated pulse improve the noise immunity as well. This is the figure of the circuit;
The diode is employed to prevent the capacitor voltage to be discharged when the transistor is grounding the supply voltage source to send a zero pulse. If the sensor or input system need a supply, we can tap the power from the 1uF capacitor, as long as it need only small current. [Circuit diagrams source: Microchip Application Note]
Tuesday, July 30, 2013
Tunable Bandpass Filter Circuit Diagram
One of the difficulties in the design of higher-order tunable bandpass filters is achieving correct tracking of the variable resistors in the RC networks. The use of switched capacitor networks can obviate that difficulty, as is shown in this filter. The filter can be divided roughly into two stages: an oscillator that controls the electronic switches arid the four phase-shift networks that provide the filtering proper.
Tunable Bandpass Filter Circuit Diagram
The oscillator, based on a 555, generates a pulsating signal whose frequency is adjustable over a wide range: the duty factor varies from 1:10 to 100:1. Electronic switches ESI through ES4 form the variable resistors whose value is dependent on the frequency of the digital signal. The operation of these switches is fairly simple. When they are closed, their resistance is about 60 ; when they are open, it is virtually infinitely high. a switch is closed for, say, 25% of the time, its average resistance is therefore 240 . `Varying the open:closed ratio of each switch varies the equivalent average resistance.
The switching rate of the switches must be much greater than the highest audio frequency to prevent audible interference between the audio and the clock signals. The input signal causes a given direct voltage across CI, so the op amp can be operated in a quasisym-metric manner, in spite of the single supply voltage. The direct voltage is removed from the output signal by capacitor C10. The fourth-order filter in the diagram can be used over the entire audio range and it has an amplification of about 40, although this depends to some extent on the clock frequency. The bandwidth depends mainly on the set frequency. The circuit draws a current of not more than 15 mA.
Sunday, July 28, 2013
Electric Wiring Fuseboxhouse Stock Photo 27569707
Way Switch Wiring Diagram Variation 3 Electrical Online.
Electrical Wiring Diagram Bathroom.
250 And 525 Sx Mxc Exc Electrical System And Wiring Diagram Here.
Kelvin Home Electrical Wiring Trainer Kelvin Com.
All About Wiring Diagrams.
Free Wiring Diagrams Download Free Wiring Schematics.
House Wiring.
Outdoor Lighting Wiring Diagram 2 Gang Switch.
Electric Wiring And Fusebox In A House Stock Photo 27569707.
Typical Ac Panel Wiring Diagram.
Wednesday, June 12, 2013
Colour Sound Organ Circuits
circuit
parts Qty. Description
C1 1 22uf 250V Electrolytic Capacitor
C2 1 22uf 250V Electrolytic Capacitor
C3 1 0.1uf Disc Capacitor
C4 1 0.01uf Disc Capacitor
C5 1 0.0047uf Disc Capacitor
R1 1 47K 1/2 W Resistor
R2, R4 2 6.8K 1/2 W Resistor
R3, R5 2 1M 1/2 W Resistor
R6 1 3.3K 1/2 W Resistor
R7, R8, R9 3 1K 1/2 W Resistor
R10, R11, R12 3 10K Pot
D1 1 1N4004 Diode
Q1, Q2 2 2N3904 NPN Transistor (2N2222)
Q3, Q4, Q5 3 106B1 SCR (Teccor S2003LS1)
T1 1 10K:600 Ohm Audio Transformer
S1 1 SPDT Switch
J1, J2, J3 3 AC Socket
MISC 1 AC Line Cord, Crystal Microphone, Case, Wire
1. R10, R11 and R12 control the response of the different lights.
2. The circuit can handle up to 300 watts per channel.
3. This circuit is NOT isolated from the 115 Volt line. If it is used with the case opened or not installed in a case, you could recieve a bad shock or be killed.
4. You can also use the Teccor S2003LS1 SCR for SCR1. These give better sensitivity and brightness than the 106B1 units.
5. Thanks to James Maloway for redrawing the schematic.
Dont Discard The Waste Light Bulbs
10Watt Audio Amplifier with Bass boost circuit
Circuit diagram
parts list
P1_________________22K Log.Potentiometer (Dual-gang for stereo)
P2________________100K Log.Potentiometer (Dual-gang for stereo)
R1________________820R 1/4W Resistor
R2,R4,R8____________4K7 1/4W Resistors
R3________________500R 1/2W Trimmer Cermet
R5_________________82K 1/4W Resistor
R6,R7______________47K 1/4W Resistors
R9_________________10R 1/2W Resistor
R10__________________R22 4W Resistor (wirewound)
C1,C8_____________470nF 63V Polyester Capacitor
C2,C5_____________100µF 25V Electrolytic Capacitors
C3,C4_____________470µF 25V Electrolytic Capacitors
C6_________________47pF 63V Ceramic or Polystyrene Capacitor
C7_________________10nF 63V Polyester Capacitor
C9________________100nF 63V Polyester Capacitor
D1______________1N4148 75V 150mA Diode
IC1_____________NE5532 Low noise Dual Op-amp
Q1_______________BC547B 45V 100mA NPN Transistor
Q2_______________BC557B 45V 100mA PNP Transistor
Q3_______________TIP42A 60V 6A PNP Transistor
Q4_______________TIP41A 60V 6A NPN Transistor
J1__________________RCA audio input socket
Power supply circuit
Circuit diagram
Parts R11_________________1K5 1/4W Resistor
C10,C11__________4700µF 25V Electrolytic Capacitors
D2________________100V 4A Diode bridge
D3________________5mm. Red LED
T1________________220V Primary, 12 + 12V Secondary 24-30VA Mains transformer
PL1_______________Male Mains plug
SW1_______________SPST Mains switch .Electronics Circuit Application
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