3 transistor fm transmitter12/8/2023 ![]() Arduino sketches are uploaded through any USB-Serial adapter connected to 6-PIN ICSP female header. It has 14 digital input/output pins (0-13) of which 6 can be used as PWM outputs and 6 analog inputs (A0-A5). Board features 28-PIN DIP IC socket, user replaceable ATmega328 microcontroller flashed with Arduino bootloader, 16MHz crystal resonator and a reset switch. Arduino Prototype uses all standard through-hole components for easy construction, two of which are hidden underneath IC socket. It's small, power efficient, yet customizable through onboard 2 x 7 perfboard that can be used for connecting various sensors and connectors. It's breadboard compatible so it can be plugged into a breadboard for quick prototyping, and it has VCC & GND power pins available on both sides of PCB. Headphone amplifier is small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from a single 9V battery.Īrduino Prototype is a spectacular development board fully compatible with Arduino Pro. 8-DIP machined IC socket allows to swap OPA2134 with many other dual opamp chips such as OPA2132, OPA2227, OPA2228, dual OPA132, OPA627, etc. Unlike other ESR Meters that only measure ESR value this one measures capacitor's ESR value as well as its capacitance all at the same time.Īudiophile headphone amplifier kit includes high quality audio grade components such as Burr Brown OPA2134 opamp, ALPS volume control potentiometer, Ti TLE2426 rail splitter, Ultra-Low ESR 220uF/25V Panasonic FM filtering capacitors, High quality WIMA input and decoupling capacitors and Vishay Dale resistors. ![]() It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic capacitors. It also analyzes transistor's characteristics such as voltage and gain. There should be no ripple in the supply voltage, otherwise it may be heard in the receiver.ĮSR Meter / Capacitance / Inductance / Transistor Tester KitĮSR Meter kit is an amazing multimeter that measures ESR values, capacitance (100pF - 20,000uF), inductance, resistance (0.1 Ohm - 20 MOhm), tests many different types of transistors such as NPN, PNP, FETs, MOSFETs, Thyristors, SCRs, Triacs and many types of diodes. You can use power supply of 5-12V or a battery. At its simplicity, however, the circuit works surprisingly well and the range is about 20 to 100 meters. The antenna is connected directly to the oscillator, so if you touch it or placing it near the conductive object, the frequency shifts. The disadvantage of the circuit is sensitivity to changes in supply voltage (it is changing the varicap voltage and thus the operating frequency). You can also use a transistor with different type of case. The transistor is a high-frequency planar PNP type, for example, BF970, BF979, BC559 or similar. I used the varicap MV209 made by Tesla with yellow paint on the cathode. Varicap is arbitrary, which covers the range of about 5-20pF, such as MV2105, MV2109, MV209. L1 with outstretched turns - lower inductance - higher frequency. Inductor L1 with turns close together - larger inductance - lower frequency. Inductor L1 is airborne and has six turns of 0.5 mm diameter wire wound on 3 mm diameter. The circuit can be powered from 5V USB port available on your PC or laptop. It is also possible to tune while already connected to the signal source. You can then connect audio source to the input (such as cassette player, CD or MP3 player, record player, audio output of PC or laptop, etc.). Proper tuning is indicated by the radio getting silent. Turn on the transmitter and the first tune the operating frequency of roughly by stretching turns in the coil L1. Turn on the FM radio and tune it to an unoccupied frequency in the 87.5 - 108 MHz band.
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