The RF Tester (A3014) is a combination of four circuits. Its purpose is to test several circuit ideas, both by implementing them, and by providing better support circuits for their development. The Modulating Transmitter (A3014MT) replaces our original Modulating Transmitter ( A3001A ). The A3014MT allows you to set the DC voltage applied to a MAX
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2624 with a potentiometer, and then AC couple your modulation waveform through a BNC socket. The SAW Oscillator (A3014SO) uses precise SAW filters to produce precise RF reference frequencies. We can use these as stable, accurate local oscillators for downshifting our RF signals, or we can use them as reference RF signals with which to calibrate our receivers. The TQFP-48 Programmer (A3014TP) uses a TQFP-48 socket to program Lattice Semiconductor LC4064 chips in 48-pin thin quad flat pack packages. This allows us to program the chips before mounting them on a transmitter, so that no programming connection need be present on the transmitter. The Demodulating Receiver (A3014DR) takes as input an LO and RF signal through BNC sockets. The LO should be +7 dBm for optimal operation of the A3014DR`s mixer. The RF signal should be in the 900-MHz ISM band. The A3014DR output is the demodulated RF signal, similar to that of the A3005B. This circuit uses the phase shift and attenuation of SAW filters to create a SAW oscillator. The circuit gives us a choice of three different SAW filter footprints to choose from. We select which footprint to use by means of R1-R3 and C4-C6. The footprints L1, L2, and L3 are for 3. 0-mm, 3. 8-mm, and 5. 0-mm surface mount packages respectively. The 5. 0-mm footprint on the A3014SO is incorrect. It uses pins 2 and 6 for the input and output respectively, instead of pins 1 and 5. The SAW filters in...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
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....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
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....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
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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