One of these coils have been tested in the TX200 transmitter as a substitution for an air coil and a variable capacitor. As a result the frequency stability was greatly improved. The meter uses PIC16F876A microcontroller with built-in ADC (Analog to Digital Converter) and 16×2 green backlighted LCD display. Special Edition Accurate LC Meter Kit Build your own Special Edition Accurate LC Meter (Inductance Meter / Capacitance Meter) and start making custom made precision coils and inductors.
Rear panel fixings are held with M3 nut and bolts, and panels that join to the heatsinks are held by M4 bolts tapped directly into the heatsinks so no additional brackets are required. You can control 16 individual microcontroller I/O pins by sending simple serial commands. USB IO Board is self-powered by USB port and can provide up to 500mA power for your projects. USB IO Board is breadboard compatible. Когда увидим, что сопротивление на тестере покажет «0», значит, мы нашли вывод нужного конденсатора, при этом подпаять разъем для аудио-наушников нужно к другому выводу этого же конденсатора. Please click here for circuit details: It is one of the easiest, simplest and the cheapest FM transmitter kit. The base-R voltage becomes nearly double the Vcc while making oscillation timing of astable multivibrator. LED can be flashed if it is attached aside.
Measurements with an RF analyzer showed that the third harmonic had a strong presence in the transmitted spectrum (about 10 dB below the fundamental frequency). This should really have been much lower. And though the science of radio is well understood, there’s a magical, emotional quality about it that we don’t often stop to appreciate. The transmitter can be supplied with 6 to 12V and offers low power consumption. It can be used as a stand alone transmitter or connected to an external VHF power amplifier to achieve an even greater transmission range. Нищебродство, конечно, но, решил всё же поделиться восторгом! На хабре были топики, краем касавшиеся этой темы:Одна была с вопросом. The output waveforms can be both amplitude and frequency modulated. Due to a relatively small number of components that the circuit is using it is possible to fit it on a small 3cm x 7cm printed circuit board.