Televideo circuit | Next Electronics

This is a compact three transistor regenerative general coverage receiver with fixed feedback. It's based on the principle of the ZN414 only much higher coverage. The sensitivity and selectivity is relatively good (especially on the LF and MW bands) as...

receiver architectures

Various architectures of receivers have been proposed in literature, but the most popular architectures among them, such as Heterodyne, Homodyne, Wideband-IF, and Low-IF, are presented here. The Heterodyne receiver architecture utilizes two frequencies: the incoming radio frequency (RF) signal and a...

Analog Equaliser

The time constant of R1C1 determines the low cutoff frequency, while the time constant of R2C2 determines the high cutoff frequency. The pass-band gain, Avpass = R2/R1. For a high-pass filter, Za must be capacitors and Zb resistors. By substituting...

Bubble display proof of concept

Some time ago, a captivating water display showcased by Jeep at conventions caught attention. The design appeared straightforward, prompting the decision to create a similar project. Instead of utilizing falling water, the concept involves using air bubbles that rise in...

Tuned radio frequency receiver

A tuned radio frequency (TRF) receiver is a radio receiver typically consisting of multiple tuned radio frequency amplifiers followed by circuits for detecting and amplifying the audio signal. A three-stage TRF receiver includes an RF stage, a detector stage, and...

modulation

A reason to modulate a message signal is to match the communication channel's frequency. This is necessary because the information to be sent over the channel is often at a relatively low frequency. For instance, the frequency range of music...

Video Line Selector

When measuring video signals with an oscilloscope, a video line selector is very useful to find a scan line. The line selector generates a trigger pulse at the selected line; the oscilloscope will display only the selected line. This is...

1-2Mhz broadcast transmitter

T1 is a low impedance output transformer with a conversion ratio of 5000 to 8 ohms. The low impedance output transformer, T1, is designed to match the output of an audio amplifier to the impedance of the speaker load. The specified...

41-72MHz micro-receiver ( MC3362 )

This receiver weighs about 6 g, used in 41 and 72 MHz, met a great success with readers of the magazine. The RX22 is the subject of these lines is improved RX20. Adding a preamp-HF improving sensitivity. Establishment of an...