Board is supplied by 2-5V voltage and may be powered by a battery such as Lithium Ion cell, two AA cells, external power supply or USB power adapter.Ģ00m 4-Channel 433MHz Wireless RF Remote Control 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. Please visit this page for detail explanation from author, schematic diagram and PCB layout of mini AM Rradio receiver circuit.ESR 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. Remember that this is the lower (solder) side, by viewing the top image you should be able to match up the positions of all components. Note that this is reverse so the veropins appear now on the left hand side at the top. The image below is an actual size (scale= 1:1) copy of the copper layer. If connections on the capacitor are reversed, then moving your hand near the capacitor will cause unwanted stability and oscillation. The moving plates should be connected to the “cold” end of the tank circuit, this is the base of Q1, and the fixed plates to the “hot end” of the coil, the junction of R1 and C1. The tuning capacitor has fixed and moving plates. The design is simple and sensitivity and selectivity of the receiver are good.Īll connections should be short, a veroboard or tagstrip layout are suitable. It is similar in principle to the ZN414 radio IC which is now replaced by the MK484. The circuit use a compact three transistor, regenerative receiver with fixed feedback. This is the circuit diagram of mini AM Radio receiver.Īll general purpose transistors should work in this circuit, you can use BC549 transistors for this circuit.
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