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In most applica- tions where the servo is permanently built into the model, allowance for slight tolerances in pulse width can be made at the transmitter. The circuit of the unit is extremely simple. When the car is unoccupied and the ignition is switched off R 1 1 holds the inputs of N5 low, so the output is high.

The output voltage V 0 is equal to the difference between the voltages at the non-inverting and inverting inputs i. Sine purity is adjusted by P4, which varies the gain of N4 and thus the amplitude of the triangle signal fed to the sine shaper. Almost any 10 k NTC thermistor may be used for R4, but the smaller types will obviously give a faster response since they have a lower thermal inertia.

When the contacts are released the input of N1 is held low by the output via Rl, so the output remains low indefinitely. Also, short single pulses will be missed comple- tely.

Elektor – Circuits

Presettable resistors may also be used. The attack time of the rectifier is extremely short! This signal is fed back via Cl to the input of the Schmitt trigger. This design rem- edies that omission. The latter choise of course implies that every reading will require a little mental gymnastics!

Since m both cases the neutral position of the control will correspond to a pulse width of 1.

Accessories inside the car, such as radios and cassette players, may also be protected by con- necting a wire from one of the alarm inputs to the earthed case of the equipment.

The flip-flop which has been set may be reset ready for the next question by pushbutton Sr. N4 back to pin 7, the data in- put, of the register. Circuit of the zener teeter. The pulse is shifted along the time axis, but this has no effect upon the operation of the servo. A conventional IF transformer is used to determine the frequency, The alignment generator is tuned to the correct frequency by passing the output signal through a ceramic IF filter.


The circuit consists of a resonant filter built around IC2 and IC3 which will ring at its res- onant frequency when a short pulse is fed to the input. Readers in countries that use 60 Hz should note that Elektor circuits are designed for 50 Hz operation.

For this reason, ‘abbrevia ted’ type numbers are used in Elektor wherever possible: However, instruments, and particu- larly complex ones elketor as oscilloscopes, tend to drift with age, and if more than a year or so old can be highly inaccurate. The value for RI depends on the amplitude of the square-wave input: A slight modification to the elketor, shown in fig- ure 2allows recording from disc while listening to a different source.

Both Valvo and Murata ultrasonic transducers are suitable for the transmitter and receiver. RCA Application Notes Monitor switching for two tape decks Although modern audio amplifiers frequently sport an abundance of seldom-used?

A1 is connected as a lin- ear amplifier with a gain of approximately Since the out- put of a microphone is very small typically a few millivolts 310 is often significant signal loss, and microphonic noise may also be gener- ated by the cable- This eelktor describes the construction of a good -quality microphone with built-in preamplifier, using a commercial electret or moving coil capsule.

The TAP is now reset to its orig- inal state. Any one oF the three waveforms may then be selected by a three-position switch and fed to an output buffer amplifier. To ensure that the lighting is supplied solely by the AC voltage, each carriage is DC decoupled by means of a capacitor. The original tape monitor switch if fitted can be discarded and replaced by S2, while an extra hole must be drilled in the front panel for S3.

Simple CMOS square wave generator.

Elektor – 301 Circuits.pdf

The direct and phase-shifted signals are summed by IC2d. When constructing the circuit par- ticular care should be taken to ensure that the 0 V rail is of low resistance heavy gauge wire or wide p. C is related to the distance between the plates of the capacitor by the equation d where k is a constant.

U, not V The international letter sym- bol ‘U ‘ for elekktor is often used instead of the ambiguous ‘V’. Automatic mono elekttor switch. TJ re- ceives a bias voltage from the supply via R4 and draws current from the supply through the zener under test.


Elektor – 301 Circuits

The diaphragm of the microphone is made of the electret material. This is sufficiently long for the indication to be seen. In cases where the symmetry improves as the wiper of P2 is turned down towards the output of N3 but exact sym- metry cannot be obtained, the top of R4 should be connected in the alternative position.

The counter output is used to switch transistor T1 on and off, and the collector signal of T1 is fed to the output amplifier A4, Since the collec- tor resistor of Ti receives its supply from the output of the envelope follower, the eleltor of the collector signal, and hence of the output signal, varies in sympathy with the amplitude of the original input signal.

The circuit utilises dlektor fact that a DC motor will not operate off an AC supply, and that, further- more, has a fairly high impedance if the frequency of the AC voltage is high enough. Both the buffered and unbuffered versions of the may be used. The clock frequency, and hence the speed of the running light, can be altered by means of PL R Elemtor is achieved by feeding the zener via Ri from the output of the op-amp.

The oscilloscope time- base speed should be adjusted so that the display of the four voltage levels just occupies the whole screen width.

This is driven from an identical astable to that in figure 1b, While the output of Nl is low and Cl is charg- ing, the output of N2 is high and C2 is discharg- ing into C3, and vice versa. When the microphone is unplugged after use the preamp is automatically switched off. Manufacturers of electric fires have realised this fact, and attempted to entice the consumer to buy electric by fitting the front of their fires with a coal- or log effect.