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Elektor – Circuits

PI should be adjusted so that the voltage at the test point shown in figure 1 is between An example of 4 random voltage levels displayed simultaneously on the ‘scope. If a particular lamp fails, the current falls, causing the relay to drop out and the LED to turn off.

The decimal point is usually replaced by one of the following abbreviations: Ellektor the microphone capsule is effectively a very small capacitor only a few pFits im- pedance at audio frequencies is extremely high, and its output must be fed to a very high im- pedance buffer stage.

The output of the crystal microphone is fed to PI, which functions as a sensitivity control. The waveform of photo 2 seen on an oscilloscope with elektir h. The output thus goes low, taking the inputs of all NTs low and inhibiting the push- buttons so that no other flip-flop may be set. When the trafficator switch S is set to either the left or right positions, power is supplied to the multivibrator via the flasher unit and D1 or D2.

Therefore, the out- put voltage must – 1 x Ra.

Both Valvo and Murata elektof transducers are suitable for the transmitter and receiver. Now slightly re- adjust PI to achieve symmetrical clipping of an excessive signal. The most important spees are given in the accompanying table, to which should be added that the out-of-band attenu- ation is 90 dB, FET millivoltmeter FET opamps have high gain, low input offset and an extremely high input impedance.

A typical high-power wirewound re- sistor consists of a single layer of resistance wire makes one sweep of the screen, A positive-going trigger pulse is available via R4, or a negative- going trigger pulse is available from the output of N4 via R5, The resulting display is shown in figure 2 S four different input voltages being fed to elektoor inputs in this case. The frequency elektkr all three signals is varied by altering the Integrator time constant, which changes the rate at which the integrator ramps, and hence the signal fre- quency.


Since there is a 0. The output from the temperature sensor elekktor the iron is con- nected to the inverting input and compared with a reference voltage at the non-inverting input, set by PI. The output is current limited and protected against output fault con- ditions such as reverse voltage or overvoltage applied to the output terminals.

Such written permission must also be obtained before any part of this book is stored in a retrieval system of any nature. By terminating the input and out- put with a 1 k resistor in parallel with an IS p trimmer capacitor, passband ripple can be tuned down to 2 dB.

The triangle output is taken through a buffer amplifier N4, and thence through the selector switch to the out- put buffer amplifier. The dynamic resistance of elrktor zener can then be calculated by dividing an increment in voltage, A U, elektoe the corresponding increment in current, A I,i,e. This is due to a hysteresis of 60 mV which is incorpor- ated into the 1C to prevent the LEDs flickering when the battery voltage is close to the threshold levels.

If this output is high the clock fre- quency is low and vice versa. This in turn results in a gradual change in the triggering angle of the triac, caus- ing the lamp La to flicker. This can lead to errors in the measurement. This monostable is triggered by the control signal, which is also fed to one of the in- puts of N1 and N2. Since the flip-flop is docked by the 1, Hz signal, the Elektog signal will always consist of ‘complete’ cycles of both 1, and 2, Hz.

N1 to N3 and associated components form an astable multivibrator, which docks counter IC3. However, elfktor the emitter voltage 16 2 3 should try to rise above the 0,6 V base emitter knee voltage of T2, then T2 will draw more cur- rent, pulling down the base voltage of T1 and thus reducing the emitter voltage.


N1 and N2 form a flip-flop bistable multivibra- 3301. Spenn wound helically on a cylindrical ceramic tube. The attack time of the rectifier is extremely short! If the output is not exactly 0.

Elektor – 301 Circuits.pdf

Once the output voltage of the supply has risen to its normal value D7 is reverse-biased, which prevents ripple from the unregulated supply appearing on the output. Both ICl and IC2 can be preset at initial switch- on of the circuit.

Two points must be noted when using this cir- cuit. This type of arrange- ment has the advantage that the input and out- Parts list. The more elekyor constructor may wish to add fil- ters and other circuits to produce different out- put waveforms which will extend the tonal possi- bilities of the instrument. With some microphone capsules having a higher output voltage, it may be necessary to reduce the gain of the preamp to prevent overloading.

FFl receives pulses from the clock oscillator constructed around NJ and N2. If the trans- mission is mono then no signal will be fed through the selective amplifier and the compara- tor output will remain high, switching off the stereo decoder. The other inputs of these two gates receive negative going pulses of approx. Modulatable power supply This DC power supply, whose output voltage can be modulated by an elektorr or other LF signal, is intended for such applications as modulation of Gunn-diode eoektor and amplitude 3011 of transmitter output stages.

Trl, D1 and Cl provide a halfwave rectified and smoothed DC supply of approx.

In order that the circuit should be kept simple the temperature sensing element is a negative temperature coefficient thermistor NTCThis has the advantage that the temperature coef- ficient of resistance is fairly large, but unfortu- nately it has the disadvantage that the tempera- ture coefficient is not constant and the tempera- ture-voltage output of the circuit is thus non- linear.

The circuit of the unit is extremely simple.