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Pulse-Generator & Signal-Tracer with BC547,BC557

Dual-purpose test-instrument Very simple circuitry, 1.5V Battery-operated

This simple circuit generates narrow pulses at about 700-800Hz frequency. The pulses, containing harmonics up to the MHz region, can be injected into audio or radio-frequency stages of amplifiers, receivers and the like for testing purposes. A high-pitched tone can be heard from the speaker of the device under test when all is working properly. The clip must be connected to the ground of the device under test, touching with the probe the different stages of the circuit, starting from the last stage and going up towards the first. When the tone is no longer heard, the defective stage has been found. [...]

Parts:
R1__________________1M 1/4W Resistor
R2,R4_______________2K7 1/4W Resistors
R3________________150K 1/4W Resistor
C1__________________2n2 630V Ceramic or Polyester Capacitor (See Notes)
C2,C3_______________4n7 63V Ceramic or Polyester Capacitors
D1_______________1N4148 75V 150mA Diode
Q1________________BC547 45V 100mA NPN Transistor
Q2________________BC557 45V 100mA PNP Transistor
SW1________________SPST miniature Slider Switch (See Notes)
J1_________________Stereo switched 3mm. Jack socket (See Notes)
Probe______________Metal Probe 3 to 5 cm. long
Clip_______________Miniature Crocodile Clip
B1_________________1.5V Battery (AA or AAA cell etc.)

Read More Source: http://www.redcircuits.com//Page59.htm
Thank you.

Be the first to comment - What do you think? Posted by admin - September 10, 2007 at 10:25 pm

Categories: Circuit diagram, Meter Tags: BC547, BC557, Circuit diagram, electronic test equipment

XTR106: 4-20mA Current Transmitter with Bridge Excitation And Linearization

The XTR106 is a low cost, monolithic 4-20mA, two-wire current transmitter designed for bridge sensors. It provides complete bridge excitation (2.5V or 5V reference), instrumentation amplifier, sensor linearization, and current output circuitry. Current for powering additional external input circuitry is available from the VREG pin.

The instrumentation amplifier can be used over a wide range of gain, accommodating a variety of input signal types and sensors. Total unadjusted error of the complete current transmitter, including the linearized bridge, is low enough to permit use without adjustment in many applications. The XTR106 operates on loop power supply voltages down to 7.5V.

Linearization circuitry provides second-order correction to the transfer function by controlling bridge excitation voltage. It provides up to a 20:1 improvement in nonlinearity, even with low cost transducers.

&The XTR106 is available in 14-pin plastic DIP and SO-14 surface-mount packages and is specified for the â€“40Â°C to +85Â°C temperature range. Operation is from â€“55Â°C to +125Â°C.

Source: http://focus.ti.com/docs/prod/folders/print/xtr106.html

Be the first to comment - What do you think? Posted by admin - September 4, 2007 at 10:54 am

Categories: Circuit diagram Tags: Circuit com, Circuit diagram

Your washing machine & tumble dryer on one wall outlet

This circuit enables you to connect both your washing machine and your tumble dryer on one wall outlet,
without blowing the fuse!
The trick is that the washing machine only consumes full power when heating the water.
During the other stages (pumping, tumbling, centrifuging) the power consumption is much lower.
The circuit switches off the tumble dryer during the (brief) time that the washing machine is heating the water.

I designed & built this circuit years before I started my web site, it has been in use ever since, but I forgot about it!
Certainly a reliable design….

Because it has proved its reliability, I just copied the old circuit diagram without any changes.

Circuit description
The current of the washing machine if fed through 25 milliohm shunt resistor R6.
R6 is built with 40 x 0.25W standard resistors of 1 ohm.
Note that the dissipation in R6 is quite high at 16 Ampere: 16x16x25milliohm=6.4 Watt or 160 mW per resistor.
For 120 V application, the maximum current will be even higher; you will need even more resistors in parallel for R6!

R1 & R2 create a reference voltage of half the supply voltage.
When the AC signal across R6 is high enough, it will trigger the schmitt trigger built with IC1, R7 & R8.
The sensitivity can be adjusted with R5, I used 4 100W lightbulbs as load to set my circuit on about 400 Watts.

When IC1 is triggered, a 50 Hz square wave will appear on output pin 6. C5 will be charged fast through R9 and D1.
When C5 is charged, the schmitt trigger built with IC2 is triggered and its output (pin 6 ) will become high.
When the output of IC2 is high, the relay will switch off the tumble dryer.
D1 protects T1 against high voltage peaks from the coil of relay Re1 when it is switched off.

Read More Source :http://www.geocities.com/tjacodesign/washdry/washdry.html
Thank you.