Mutchus

This FM transmitter circuit can be used as a wireless microphone,  can be received by an ordinary 88- to 108-MHz FM broadcast receiver. For the power supply, this transmitter circuit is powered by a 9 V battery. To comply with the radiation limit of FCC rules, keep the antenna length under 12 inches. L1 is 6 turns of #24 wire wound around a pencil or a 1/4″ form, with turns spacing of 1 wire diameter. C6 is a gimmick capacitor which has value about 1 pF..  9V Wireless Microphone FM Transmitter Circuit Diagram

We described simple method, how to drive modellers servo. Today, we are going to try to drive this servo from potentiometer connected to TR module ADC. It is reaction to forum thread where is discussion about airplane model control possibility. [ ]

Wireless am microphone Transistor Ql and its associated components comprise a tuneable rf oscillator. The rf signal is fed to transistor Q2, the modulator. Operational amplifier ICl increases the audio signal and applies it through resistor R4 to the base of Q2. Tune an Wireless am microphone AM radio to an unused frequency between 800 to 1600 kHz. Tune Ll for a change in the audio level coming from the radio. Peak the output by adjusting L2 If Ll is disturbed, it may be necessary to readjust L2 for peak performance. Depending on the impedance of the microphone audio sensitivity can be increased by decreasing the value of RIO and vice versa. Wireless am microphone. Wireless am microphone

Here is a low-cost and simple wireless stepper motor controller using infrared signals. Using this circuit you can control the stepper motor from a distance of up to four meters. The circuit comprises transmitter and receiver sections. The communication between the transmitter and receiver sections is achieved through infrared signals. Wireless Stepper Motor Controllers Circuit Diagram In the transmitter section, timer NE555 ICs (IC1 and IC2) are configured as astable multivibrators with frequencies of around 1 Hz and 38 kHz, respectively. The output of IC1 is given to reset pin 4 of IC2, so the 38kHz carrier signal is modulated by 1Hz modulating signal. The modulated signal from pin 3 of IC2 is transmitted by the infrared LED.  Resistor R5 limits the current through the IR LED. The transmitted signal is sensed by IR receiver module TSOP1738 (IC6) of the receiver section and its output at pin 3 is used as clocks for dual flip-flop 74LS74 Ics (IC3 and IC4), which are configured as a...

The first thing you will notice is the clever circuitry. Some of the design goes against everything we have learnt in electronics. That’s why we have to study other people’s designs and realise “the more you know, the more you realise you don’t know.” The oscillator circuit is very interesting, but first we will look at the RF oscillator. The doorbell operates on the 303MHz band and the 30 metre range (100ft) is obtained without the use of an antenna! The circuit is actually radiating from the printed track of the tank circuit. The Tank Circuit is a single-turn coil and a small capacitor (5p & 4p in parallel). In this project we show how to add a small antenna to the circuit to get double the range – plus two other improvements to increase the range. Some of the improvements will load the circuit and alter the frequency at which it operates. Others can be done without any effect on the circuit. Fortunately, the transmitting stage is what we call “tight” and is not affected by surro...

This is a Simple Detector Wireless Electricity Circuit Diagram . This is more of those circuits quite simple, but very useful, especially in the electrical area. This detector is an electric probe, which can also be used to detect the presence of high voltage on the wires and also as a touch switch, then the LED may be replaced with a relay to connect and disconnect a device (but only when something is detected).  The circuit is very simple and consists of only three transistors, 3 resistors, 1 LED and a 9V battery. He has a high gain by being in Darlington transistors, and the probe (copper strip) is a small piece of copper or a wire.  Detector Wireless Electricity Circuit Diagram

Japanese company Toshiba introduced the drive Canvio AeroCast, which is a line of wireless devices for data storage, while keeping an impressive capacity of 1TB and supports up to six devices simultaneously. The technology, according to the manufacturer, is able to work on a single battery charge up to 5 hours of active streaming content. For convenience, copy photos from your mobile device or camera novelty is equipped with a socket for SD memory card Wireless drive Canvio AeroCast debut in Russia in 2015 at an estimated cost 7050 rubles. Canvio AeroCast supports a Wi-Fi network and creates its own network WLAN, allowing remote access to files stored on the drive from mobile devices and perform backups without wires or connect to the Internet. Content with Canvio AeroCast also be broadcast on the TV screen: it is necessary to install an application that is compatible with Google Cast. Specifications Toshiba Canvio AeroCast: Capacity: 1 TB Interface: USB 3.0 Tuxera NTFS driver for Mac ...

Here is a low-cost and simple wireless stepper motor controller using infrared signals. Using this circuit you can control the stepper motor from a distance of up to four metres. The circuit comprises transmitter and receiver sections. The communication between the transmitter and receiver sections is achieved through infrared signals. Fig. 1: Infrared transmitter In the transmitter section, timer NE555 ICs (IC1 and IC2) are configured as astable multivibrators with frequencies of around 1 Hz and 38 kHz, respectively. The output of IC1 is given to reset pin 4 of IC2, so the 38kHz carrier signal is modulated by 1Hz modulating signal. The modulated signal from pin 3 of IC2 is transmitted by the infrared LED.  Resistor R5 limits the current through the IR LED. The transmitted signal is sensed by IR receiver module TSOP1738 (IC6) of the receiver section and its output at pin 3 is used as clocks for dual flip-flop 74LS74 Ics (IC3 and IC4), which are configured as a ring counter. Fig. 2:...

This FM wireless microphone is easy to build and has a useful range of transmission (over 300 meters outdoors). Despite its small number of components and an operating voltage of 3V to easily penetrate over three floors of an apartment building. You can tune anywhere on the FM band ( 87-108MHz ) and its transmissions can be picked up at any point of view of the FM receiver. The coil (L1) should be approximately 3 mm in diameter, 5 turns 0.61 mm copper wire. You can vary the Tx frequency by simply adjusting the distance between the coils. The antenna should be a half wavelength or quarter-time (100 MHz, 150 cm or 75 cm). Parts list: T1,T2,T3: 2N2222 transistor R1: 10k 5% R2: 33k lin. R3: 12k 5% R4: 5.6k 5% R5: 2.2k 5% R6,R8: 47k 5% R7: 470 ohms 5% R9: 180 ohms 5% C1,C2: 47nF C3: 1nF C4: 33pF C5: 5.6pF C6: 8.2pF C7: 10nf L1: 3mm in diameter with 5 turns 0.61 mm copper wire K1: SPDT toggle switch Other parts: 2 AA battery holder, Electret microphone, antenna wire