Mutchus

Before I began the installation of my Yaesu FT-8800 in my car I knew I wanted automatic power ON / OFF. This is a feature that I have always felt was lacking in my other mobile rigs as I am forever leaving my ham radio on long after I have departed the car. Let’s start with an action packed video of the finished product, then we can talk about how we got there. [ ]

The TEA5764UK is a single chip electronically tuned FM stereo Radio with Radio Data System (RDS) and Radio Broadcast Data System (RBDS) Demodulator and RDS/RBDS decoder for portable application with fully integrated IF selectivity and demodulation. The Radio is completely adjustment free and only requires a minimum of small and low cost external c visit page. AM/FM Stereo Radio Circuit

SW Converter for AM Radio Circuit diagram. Apart from chucking it in the bin, what can you do with old AM car radio or clock radio in your junkbox? How about turning it into a crystal controlled, stable, short wave radio receiver, for a minimum investment in time and money? Read on. The heart of the circuit shown here is an IC which goes by the name NE602, NE612 or SA612. It is a double balanced mixer that includes an oscillator that can be crystal-controlled, free running or even driven externally from a PLL, etc. It was originally designed for mobile telephones and is probably available in junked car phones from the tip. The NE602/612 contains a differential input amplifier (called a Gilbert Cell), an oscillator/buffer, a temperature compensated bias network and a power regulator. Typical frequency response is in excess of 500 MHz for the input and 100 MHz for the oscillator. SW Converter for AM Radio Circuit diagram : SW Converter for AM Radio Circuit Diagram   Supply current ...

I have received a number of emails regarding schematics for crystal radios. After about the third email, I figured that I may as well put one on my page. So here it is. The circuit is very simple with only 5 parts, but performs very nicely when used with the right size antenna.    Circut  Schematic Part Total Qty. Description Substitutions C1 1 Tuning Capacitor (See Notes) D1 1 1N34 Germanium Diode L1 1 Loopstick Antenna (See Notes) SPKR1 1 Crystal Earphone MISC 1 Wire, Board, Wire For Antenna, Knob For C1 Notes C1 and L1 can be bought, or salvaged from an old AM radio (which is where I got mine). You may need to experiment with the connections on L1 in order to get the best (or any) signal. You may or may not need the ground connection. I never use it and the radio usually works fine without it. The bigger the antenna, the more stations you pick up and the louder you hear them. On my radio, I get about 10 stations, 3 of which are very loud in the earphone. Of course, not...

AM-FM Radio – Philips – Circuit diagram – Wiring diagram Circuit diagram and PWB

TX-2B / RX / 2B  5 channel radio remote control. This article is about a simple 5 channel radio remote control circuit based on ICs TX-2B and RX-2B from Silan Semiconductors. TX-2B / RX-2B is a remote encoder decoder pair that can be used for remote control applications. TX-2B / RX-2B has five channels, wide operating voltage range (from 1.5V to 5V), low stand by current (around 10uA), low operating current (2mA), auto power off function and requires few external components. The TX-2B / RX-2B was originally designed for remote toy car applications, but they can be used for any kind of remote switching application. Circuit diagrams and description . Remote encoder / transmitter circuit. 5 channel redio remote control encoder / transmitter circuit The TX-2B forms the main part of the circuit. Push button switches S1 to S5 are used for activating (ON/OFF) the corresponding O/P channels in the receiver / decoder circuit. These push button switches are interfaced to the built-in latch...

 AM Radio built around LM555 Circuit AM radio built around 555 timer chip. The only active device (silicon, germanium, or otherwise) is the LM555. The tuning is accomplished with an inductor and a capacitor, and the LM555 acts as an AM demodulator and class-D power amplifier to drive the speaker. You may be wondering how all this is accomplished with a 555. Here’s how the circuit works: The AM radio signal is tuned by inductor L, which is 300 turns of wire on a 1/2 inch diameter cardboard tube made out of a paper roll, along with the 100pF variable capacitor. One end of the parallel configuration of L and C connects to an antenna (surprisingly long!) and the other end connects to a ground wire which is tied to the AC outlet ground (old books tell you to ground it to a water pipe).    So far this is exactly like an AM crystal radio. The 555 timer is configured as a pulse width modulator in a non-traditional configuration. If I used the standard approach and connected t...

Experts a nd amateurs have been Experimenting with radios without batteries since the wireless communication started. In many designs we've seen radios that operate without power, but all are known to use the diode 1N34. (Crystal Radio). Although significant improvements have increased the sensitivity and selectivity of these system circuits, Performances were limited until new techniques have emerged.    Here we have the first transistor radio that works without batteries, it is powered by random electric fields are everywhere in the atmosphere.  These circuits are relatively cheap to manufacture, have more volume and better reception from the crystal radios.   This circuit is a medium wave receiver and attaches easily to frequencies from 500Khz to 11Mhz. To get good results in the reception of radio stations, we should give great importance to the ground and the antenna. To listen to distant and weak stations we have to use a battery 9volt parallel with the capaci...

Description. Circuit shown here can be used to jam FM radios in its vicinity. The circuit is nothing but a classic single transistor oscillator operating in the VHF region. Working principle of the circuit is very simple and straight forward. Powerful VHF oscillations from the circuit will interfere with the FM signals to nullify it. Jammer circuits like this are illegal in many countries and you must assemble this circuit on your own responsibility. This circuit is intended only for fun and i request you not to misuse it. Circuit diagram. Notes. For L1 make 6 turns of 16AWG enamelled copper wire on a 9mm plastic former. The circuit can be powered using a 9V PP3 battery. For extended range, use an antenna. A 30cm long wire connected anywhere on the coil will do for the antenna. For better performance, assemble the circuit on a good PCB.