The The reciprocating detector was designed by R. S. Badessa at M. I. T. The RD features a carrier-synthesized reference signal and requires no external bfo. The circuit offers advantages over conventional detectors in that it adjusts its bfo level automatically in proportion to the average signal level received. First introduced in ham Radio in March,
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1972, the RD has gone through several metamorphoses. The version presented here uses ICs and can be used in modern receivers using semiconductors. Also included is a design for a 10. 7-MHZ ssb filter for single-passband receivers. Editor. During the past three years I`ve had many requests for revisions to the reciprocating detector circuit so that it can be used directly at high frequencies. Here`s an updated IC design that can be used at frequencies up to 20 MHz. required very careful circuit layout to reduce or eliminate inter-circuit coupling, and in particular to maintain the correct phase relationship required in the feedback loop. Also, the detector portion operated as a half-wave rectifier. A current-regulating source had to be adjusted to cause the signal diode to operate at a level just below conduction, so that at frequencies above 5 MHz the diode and its circuitry ceased to perform uniformly. Result - a badly distorted detected signal. Despite the distortion, in some cases the circuit performed well enough for signal identification. But much was to be desired. A cure for individual cases was to adjust the bias level for the current-source diode until it just conducted on noise. In most cases, with a tube receiver that produced i-f signals to the RD input exceeding the saturation level of the complete circuit, a clipped response occurred. Single sideband signals then became unmanageable because of widely varying...
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The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
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The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
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In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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