wireless basic circuit
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Wireless remote control switch circuit 5
The wireless remote control transmitter circuit consists of control buttons S1 to S16, resistors R1 to R3, a capacitor C1, a regulator diode VS, a crystal oscillator BC1, and DTMF encoder integrated circuits IC1 and IC2. The circuit components are...
Receiver Audio Circuit
This simple receiver AF amplifier can supply several hundred milliwatts to an 8-ohm speaker. The gain is approximately 200X. If high gain is not required, C2 can be removed, resulting in a gain of 20. R1 and C6 are essential...
RF wireless allarm magnetic switch PIC16F84
This circuit was formed to create a wireless alarm from a normal magnetic contact. By fixing the magnet to the leaf of a door, or swing of a drawer, it is easy to reveal the opening. To transmit the signal...
Wireless Bug detector
This fairly simple circuit makes it possible to place such a wall as a conduit to locate. It is a conduit for power, no water or gas-seeker. The only requirement is that there is tension on the line. The antenna...
Single injector-tracer
In the "Trace" mode, the non-linear operation of the amplifier will detect modulated RF signals, which will be filtered by the 0.001 µF capacitor and heard in the headphones. In the "Inject" mode, this circuit will provide a nominal square...
Transmitter Negative Key Line Keyer
Using an NTE288 (or ECG288, GE223, or SK3434), this circuit can key a negative line up to -300 V maximum. Do not use this circuit to key a vacuum-tube amplifier that draws grid current because the keying transistor might be...
RF communication use a sample circuit(example in AVR)
Even including labor, the actual cost of purchasing, stocking, assembly, assembly errors, more expensive PCBs (with additional holes and larger sizes), and the increased difficulty in tuning would likely result in significantly higher expenses.
The analysis of costs associated with electronic...
tv transmitter
The transmitter operates within the VHF and VLF frequency ranges on TV channels, though it has not been tested for UHF frequencies. The modulated sound signal spans 5.5 to 6 MHz, which can be adjusted by tuning capacitor C5. The...
RF Inductance Meter
This RF inductance meter measures RF chokes in the 500 nH to 50 µH range. A simple solution was required to measure hand-wound RF inductors in a secondary lab setting. The user intended to utilize this device occasionally and did...