Wiring Schematic diagram

Wednesday, September 3, 2014

Insulation Resistance Test Or Megger Test Procedures With Wiring diagram Schematic In this

In this article we will go through Megger test first of all i want to say both insulating
resistance tests and megger test are same. which is usually carries out to find the insulation
of different machines windings conductor wires generator windings etc.
Megger Testing Instrument
Megger testing instrument is a high resistance Ohmmeter with a build in
generator

It is equipped with three connections Line Terminal (L), Earth Terminal (E) and
Guard Terminal (G)
Resistance is measured between the Line and Earth terminals
The “Guard” terminal is provided for special testing situations where one
resistance must be isolated from another.
The generator can be hand-cranked or line-operated to develop a high DC
voltage which causes a small current through and over surfaces of the
insulation being tested
Which is measured by an ohm meter having an indicator scale
Importance Of Insulation Resistance Test Or Megger Test
An insulation test is carried out to test the integrity of the insulation between
conductors.
Which help to find the short schema problems in the schema
It also serves as the best guide to indicate the health of the equipment
Procedure To tests the Insulation
Test the megger before use, whether it gives INFINITY value when not
connected, and ZERO when the two terminals are connected together and the
handle is rotated.
To do the test you ensure the cable is disconnected from any devices (megger
normally work on 500v, 1000v testers for higher voltage testing).
Make sure that no eddy current in the device by earthing it.(very important)
Instrument should be in normal working temperature because resistance is
related to temperature.
Ensure both ends of the cables are separated from each other (connect one end
in terminal strip if necessary).
Now connect the megger terminals to the conductors which has to be meassured
Then hand crank the generator and a high DC voltage generated which causes a
small current through and over surfaces of the insulation being tested.
If the Reading shows Infinity means the conductors having good insulation.
Here it shows a megger schema diagram
Image credits:tpub.com,electrical-engineering-portal.com
Bijoy

Simple 10 A Stabilized Wiring diagram Schematic

This is a heavier power supply that can deliver. 10A stabilized. The schema is built around a normal 78xx controller, but for extra power equipped with T1.For the 78xx can be taken any type. Keep in mind that the input voltage of the regulator, as the output-voltage.

3V higher See 78xx power for the available controllers.T1 must be mounted on a large heatsink when installing large capacity decreased.A negative variant of this food can be found here.

10A Stabilized Circuit Diagram

Warning: This diet is not short schema proof.

Parts List

     R1, R2 = 0.18 Ω 5W
     R3 = 2.2 Ω 2W
     C1 = 22000μF
     C2, C3 = 1μF
     B1 = 35A
     T1 = MJ15004
     IC1 = 78xx

Make an Oscillator 50 300 MHz Colpitts Type Circuits Wiring diagram

Simple but high efficiency of this schema is a Colpitts oscillator for VHF. Ideal for higher frequencies above 50 MHz, Colpitts oscillators are used for VHF parasitic capacitance of the schema is in parallel with the feedback capacitance desired and causes no undesired spurious resonances which may occur with the Hartley oscillator.

The schema above is a VCO FM, it is a grassroots project with grounded feedback from collector to emitter. A Colpitts oscillator is a series of designs for electronic oscillator diagram using a combination of an inductance with a capacitor to determine the frequency.

Make an Oscillator 50-300 MHz Colpitts Type Circuits Diagram

12 Volt to 32 Volt CT converter DC to DC

Kit that can change the normal 12v dc voltage from a car battery, battery bike 12V motor. With the current 7A. so this circuit is very suitable for power car amplifiers and sound systems that use simple 12V battery.

Kit converter is also equipped with inputs "SEND" to activate the circuit and also send this interchangeable inputs is connected to the Tape / cd / dvd player of your car. And input "send" is if the non-connected with an output of "send" player car you then connect it to +12 hrs on v from the battery / batteries The series is already in the test kit and has been functioning normally.

Tuesday, September 2, 2014

Paraphase Tone Controller

As opposed to the widespread Baxandall schema (dating back to 1952!) a ‘paraphrase’ tone control supplies a straight frequency response as long as the bass and treble controls are in the same position. This unique property makes the ‘paraphase’ configuration of interest if only treble or bass needs to be adjusted - it is not possible to adjust both at the same time! Essentially, it’s the difference in setting of the tone controls that determines the slope of the frequency response, and the degree of bass/treble correction. The schema is simplicity itself, based on two networks C1-C2-C3/R9-R10-R11 and C5-C6-C7/R12-R13-R14.

Picture of the project:

Paraphase Tone Controller Circuit

The first is for the high frequencies (treble) response, the second, for the low frequencies (bass). The roll-off points have been selected, in combination with C4 and C8, for the sum of the two output signals to re-appear with a ‘straight’ frequency response again at the output. Roughly equal output levels from the networks are ensured by R6 = 7.15 k and R8 = 6.80 k. However, the operating principle requires the input signals to the two networks to be in anti-phase. For best operation the networks are driven by two buffers providing some extra gain.

Circuit diagram:

Paraphase Tone Controller Circuit Diagram

The gain of IC1.D is slightly higher than that of IC1.C to ensure the overall response curve remains as flat as possible at equal settings of the tone controls. Because each network introduces a loss of about 1.72 (times), IC1.D and IC1.C first amplify the signal. The gain is set at about 8 (times) allowing input signal levels up to 1 V to pass the schema at maximum gain and distortion-free. The gain also compensates the attenuation if you prefer to keep the tone controls at the mid positions for a straight response.

Parts and PCB layout:

Parts and PCB Layout

To audio fans, the schema is rewarding to experiment with, especially in respect of the crossover point of the two networks. R3 and R4 determine the control range, which may be increased (within limits) by using lower resistor values here. The values shown ensure a tone control range of about 20 dB. IC1.B buffers the summed signal across R15. C9 removes any DC-offset voltage and R16 protects the output buffer from the effects of too high capacitive loads. R17, finally, keeps the output at 0 V. The choice of the quad opamp is relatively uncritical. Here the unassuming TL074 is used but you may even apply rail to rail opamps as long as they are stable at unity gain. Also, watch the supply voltage range. A simple schema board was designed for the project. Linear-law potentiometers may be fitted directly onto the board. Two boards are required for a stereo application. The relevant connections on the boards are then wired to a stereo control potentiometer.

Specification:

Current consumption (no signal) 8 mA
Max. input signal 1 Veff (at max. gain)
Gain at 20 Hz +13.1 dB max. –6.9 dB min.
at 20 kHz +12.2 dB max. –7.6 dB min
Gain (controls at mid position) 2.38 x
Distortion (1 Veff, 1 kHz) 0.002% (B = 22kHz) 0.005% (B = 80 kHz)

COMPONENTS LIST

Resistors

R1-R4 = 10k
R5,R7 = 1k
R6 = 7k15
R8 = 6k80
R9,R10,R11 = 8k2
R12,R13,R14 = 2k2
R15 = 1M
R16 = 100R
R17 = 100k
P1,P2 = 100k preset or chassis-
mount control potentiometer, linear law
Capacitors
C1,C2,C3 = 47nF MKT, lead pitch 5mm
C4 = 68nF MKT, lead pitch 5mm
C5,C6,C7 = 10nF MKT, lead pitch 5mm
C8,C10,C11 = 100nF MKT, lead pitch 5mm
C9 = 2µF2 MKT, lead pitch 5mm or 7.5mm
Semiconductors
IC1 = TL074
Miscellaneous
K1,K2 = line socket, PCB mount, e.g.
T-709G (Monacor/Monarch)

Author: Ton Giesberts - Copyright: Elektor Electronics

High voltage inverter circuit diagram

This inverter circuit works with a transistor and transformer and other components to increase the voltage becomes high. Input supply voltage ranging from 3V to 6V DC, later it was raised to high voltage AC. However, in this inverter circuit output current is very small, probably under 0.1A even smaller. However, its use you can apply it on a fluorescent lamp 10W maximum power only, and that too takes time to switch on fluorescent lamps.

Part List
R1 = 4K7
R2 = 2K2
R3 = 330K
C1 = 100nF
C2 = 100nF 275V
C3 = 0.22uF 275V
Q1 = D506
L1 = 100 times winding, with 0.8mm diameter copper wire
L2 = 50 times winding, with 0.8mm diameter copper wire
L3 = 5000 times winding, with 0.4mm diameter copper wire

Universal battery charger with 12V source voltage

In this post I will share about using Accu source to charge batteries that can be used on any mobile brand, or can be called universal phone battery charger. Because the battery charger using a source of 12V, the charge accumulator can also be used in cars and others.

This will out charger circuit voltage of 5 volts DC, with input from at least 6 volt battery, and voltage inputs that have been tried till with 15 volts (more than it has not been tried, because the battery that tie the maximum output voltage is only 13.8 volts).