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Elektor – Circuits : Free Download, Borrow, and Streaming : Internet Archive

The cell is charged by a constant current source T1 which is controlled by a voltage comparator based on a TTL Schmitt trigger Nl. 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 circuite, 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.

Normally RI is given the same value as R2. The input impedance of the circuit that the compressor output feeds should be as high as possible. The oscilloscope time- base speed should be adjusted so that the display of the four voltage levels just occupies the whole circuita width. The reference voltage output is fed to the two threshold inputs via presets PI and P2, which are used to calibrate the circuit. The circuit diagram of the polter- geist- transmit eelektor.

The circuit diagram of the servo polarity changer. Reaction speed tester ing LEDs I,, 10 to light up one after another. 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 amplitude of the collector signal, and hence of the output signal, varies in sympathy with the amplitude of the original input signal.

In this circuit the quiescent current through II U The circuit is provided with the possibility of AM and FM modulation.

Circuits ( Series) by Elektor Electronics Paperback Book The Fast | eBay

To make a really professional job the output of the preamp can be taken via a Cannon XLR or locking DIN connector socket mounted in the base of the housing. Any change in the input voltage at C will produce the same change at the output, but of opposite This circuit presents an interesting elekttor method of constructing a low-distortion buffer or output stage for use at low output powers.


Capacitance value 1 0 n: When the contacts are released the input of N1 is held low by the output via Rl, so the output remains low indefinitely. The clock frequency, and hence the speed of the running light, can be altered by means of PL R Both the buffered and unbuffered versions of the may be used.

It produces an output with a fundamen- tal frequency of kHz and harmonics extend- ing up to MHz and has an output impedance of 50 ohms.

Should the authentic poltergeist then fail to put in an ap- pearance, the ambitions ghost-hunter can ensure success by virtue of his electronic stand-in. This charges up C4 via Dl, holding the input of N2 high which causes the output to remain low. The zener tester described in this article feeds a known, constant current through the zener. It operates by feeding a known constant current into the base of the transistor and measuring the collector current.

Elektor – 301 Circuits

Complete circuit of the mono- stereo switch. However, to avoid the decoder switch- ing back to mono during pauses in the audio sig- nal, the decay time constant R7-C6, is made fair- ly long, and the circuit will not switch back to circuirs operation until about elektro seconds after the cessation of a stereo signal. The idea behind this article is not to put the pol- tergeist out of a job, but rather to provide a little 1 innocent fun for those of our readers inclined to practical jokes.

The value for RI depends on the amplitude of the square-wave input: A voltage between these two is referred to as an undefined logic level, CMOS logic is capable of operating over a much wider supply eletkor than TTL, typi- cally 3 – 18 V. The dynamic resistance of the zener can then be calculated by dividing an increment in voltage, A U, by the corresponding increment in current, A I,i,e.

Figure 3 is an alarm circuit that is triggered when a circuit is broken, this xircuits particularly useful in 2 69 Nl,N2-ft 4 burglar alarm systems where several switches can be connected in series. The result is that the output of IC1 is a square wave whose duty-cycle is circiuts portional to the analogue input voltage.


301 Circuits (300 Series) by Elektor Electronics Paperback Book The Fast

Output waveform of the cali- brator. Photo 1 shows an oscillograph of the complete test waveform, while photo 2 shows the pulses as seen on a cor- rectly calibrated oscilloscope.

A posi- tive bias voltage of just less than half supply voltage is applied to the selective amplifier from the junction of R2 and Dl.

When current is drawn from the battery, the right-hand end of the shunt will be at a lower potential than the left-hand end, so the output of Al will rise, and the discharge indicating LEDs D5 to D8 will light successively as the current increases.

This effect is sometimes spoilt, coal- or log- effect to simulate the appearance of however, by the fact that the lamp provides a 67 constant rather than a flickering light. A typical circuit for such a filter is given in figure 1. Obviously the chip temperature must be maintained considerably higher than ambient for correct operation since the circuit cannot cool the chip to a temperature below ambient and PI is provided to adjust the chip tempera- ture.

However, elekktor and pulse trains are frequently encountered in logic circuits. Figure 2 shows a circuit for triggering the alarm after a preset time delay that can be varied be- tween one second and one minute.

Full text of ” Elektor – Circuits ” See other formats I practical electronic circuits for the home constructor J introduction circuits The book follows the theme, and is a contirtuation of our popular and very succe sfut circuits publication.

Squarewave oscillator Temperature -com pen sated If cur- rent is passed through clrcuits one of these resistors, a corresponding voltage drop will appear across this resistor.

Cl is charged to logic high through R3 from the high output of NL If the touch con- tacts are now bridged by a finger, elejtor logic high on Cl will be applied to the inputs of Nl through Circults and the skin resistance. The cir- cuit described here is intended to remedy that de- fect. The circuit uses a second bridge rectifier D The value of Cl is determined by the maximum base current that the must supply to the series output transistor.