These units can be useful as a short-range, single-channel remote-control. When the pushbutton in the transmitter circuit is briefly activat...
Tampilkan postingan dengan label Radio/RF/Wireless. Tampilkan semua postingan
Tampilkan postingan dengan label Radio/RF/Wireless. Tampilkan semua postingan
Selasa, 25 Agustus 2009
Jumat, 21 Agustus 2009
The circuit for a powerful AM transmitter using ceramic resonator/filter of 3.587 MHz is presented here. Resonators/filters of other freq...
Rabu, 19 Agustus 2009
Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This r...
Senin, 17 Agustus 2009
An low power FM Transmitter using an op-amp as the audio preamp and a single transistor as the RF amplifier. L1 is 0.112uH (this tunes to th...
Sabtu, 15 Agustus 2009
Using the circuit of 40-metre band direct-conversion receiver descr- ibed here, one can listen to amateur radio QSO signals in CW as well ...
Rabu, 12 Agustus 2009
The “Link” intercom has been designed in such a way that you can buy parts for it ‘off the shelf’ at just about any decent electronics retai...
This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) b...
Senin, 10 Agustus 2009
A 741 or LF351 will not work in this circuit. Although I have used a 12 volt power supply, a 9 volt battery will also work here. As I was de...
Designed around the popular ZN414 ic this receiver covers the AM band from 550 - 1600 KHz with the values shown. For Longwave the coil needs...
Minggu, 09 Agustus 2009
Notes: It is illegal to operate a radio transmitter without a license in most countries. This ircuit is deliberately limited in power output...
Senin, 03 Agustus 2009
The RF oscillator using the inverter N2 and 10.7Mhz ceramic filter is driving the parallel combination of N4 to N6 through N3.Since these...
Minggu, 02 Agustus 2009
This FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-v...
The power output of most of these circuits are very low because no power amplifier stages were incorporated. The transmitter circuit descr...
