AMPLIFIED CRYSTAL RADIO by LM386

An improved crystal radio with a two-stage audio amplifier. The 2N3904 (or any other general-purpose NPN) acts as a preamplifier while the LM386 boosts the signal high enough to drive low impedance Walkman headphones or perhaps even a small speaker.

Read More Source:

http://www.geocities.com/tomzi.geo/

Thank you.

FM Transmitter with 2N2222
The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. Related Links More circuit about RF More circuit FM Antenna ...
FM Superregenerative Receiver
using only two transistors Building an AM receiver is a simple project for a beginner, but building an FM receiver is rather trickier. However, with a little ingenuity we can get away with a ve ...
VHF Test Transmitter
If you want to be independent of the local radio stations for testing VHF receivers, you need a frequency-modulated oscillator that covers the range of 89.5 to 108 MHz â€” but building such an osc ...
BA1404 HI-FI Stereo FM Transmitter
Whether you want to create your own radio station, transmit the music around the house, or simply create a wireless link between your iPod and a receiver in your car, this transmitter will let ...
Crystal Radio (and other purpose) Audio Amplifier
Here is a simple audio amplifier using a TL431 Shunt Regulator Circuit. The amplifier will provide room-filling volume from an ordinary crystal radio outfitted with a long-wire antenna and goo ...