A noise generator with a wideband output signal is always handy to have around when you’re adjusting receivers and other types of HF equipment. The noise generator circuit described here uses the base-emitter junction of a transistor (in this case a BF199) operating under reverse bias. As a result, it acts as a Zener diode[…]
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Wire Tracer (Transmitter) Schematic Circuit Diagram
The circuit depicted here forms one half of a device that will prove extremely handy when tracing the path of electrical wiring in a building or to locate a break in a wire. The system is based on similar equipment that is used by technicians in telephone exchanges. The operation is straightforward. You require[…]
Read moreWideband Waveform Generator Schematic Circuit Diagram
This circuit is designed to provide a wideband digital sine wave signal source. Its main feature is that because it synthesizes the signal in 32 steps, no low-pass filter is required to suppress the odd harmonics. A well-known method for synthesizing a sine wave under control of an input frequency is to apply a low-pass[…]
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Noise-Driven Sound Generator Schematic Circuit Diagram
The sound generator shown here uses its built-in loudspeaker as a microphone when it is in the standby state. As soon as it detects a noise that exceeds an adjustable threshold level, it becomes active. This small, clever circuit can be used as an alarm generator that reacts to noises. You can also use it[…]
Read more4-bit random generator
The generator is based on a Type 4006 quadruple shift register, IC1. Two of the shift registers are four bits long, the other two, five bits: a total of 18 bits. Only the clock is common to the registers: all inputs and outputs are separate. Of the four-bit registers, only the fourth bit is available[…]
Read moreStorage oscilloscope tester
The tester generates two different ” signals for checking a digital storage oscilloscope. The first is a stepped voltage on to which glitches are superimposed. The second is a rectangular 2 kHz signal on to which a 15 Hz analog signal is superimposed The first signal quickly shows whether the oscilloscope eliminates the glitches during[…]
Read moreNoise generator
Noise generators are used for measuring the self-noise of amplifiers and receivers and for some acoustic measurements. The noise of traditional low-frequency noise generators is based on the stochastic properties of an ion current resulting from a gas discharge. A simple noise generator can, however. be designed without a special gas discharge tubes the reverse-biased[…]
Read morePulse generator
This pulse generator can provide up to 12 pulses at its output depending on the setting of hexadecimal switches S2 – S3. The (rectangular) pulses are generated by IC3c with circuit values as shown their p.r.r (pulse repetition rate) is a few KHz. The output of generator is taken to one input of NOR gate[…]
Read moreSerial data generator
The data generator offers a simple means of testing a circuit. It does need software and all the components are readily available. The design is based on the timing of a Type SDA3002 circuit. In contrast to the two-wire I2C format, a three-wire connection is used.If only one fixed data word needs to be sent.[…]
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