In this application, we are building a gaincard like amplifier. This application type is named gainclone in the audio world. To take a satisfactory audio response, we are adding a Linkwitz equaliser to the feedback line and adding bass compensation also.
This is a universal 1 Watt RF class C amplifier that is ideally suited for low power FM transmitters. Input should be at least 100mW to achieve 1W output. It is recommended to enclose the amplifier in a metal case.
Broad band amplifiers are amplifiers which will reproduce a wide range of signals without significant loss throughout the pass band. A typical broad band amplifier is a mast head amplifier erected on a TV mast and designed not only to amplify VHF and UHF TV signals but also to establish a low noise figure. Not all broad band amplifiers are that wide so we will consider some examples here.
This will show you how to add a RF power amplifier to your Proxim Symphony for under 50 dollar. The cost is reduced by using the existing components on the Symphony, such as the PIN diode switch, and just inserting a higher power final amplifier.
JT-11-FL provides Isolated Line Output from Guitar Amplifier.
The thermal protection of amplifiers is always a concern, since overheating is a sure way to reduce the life of semiconductors and other components. Where you do not want to use a fan (such as in Project 42 - Thermo-Fan for Amplifier Cooling), then a complete shutdown can be performed.
This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least.
The main difference between single-end and push-pull, is distortion. In fact, SE produce a lot of harmonics, so a lot of distortion. Beside this is a bad idea for a power amp, this is really what a lot of people call a real tube sound.
Many times we needed to strengthen a small signal in the region of VHF or FM. The preamplifier that to you we propose offers 20dB in all the region of VHF and it still can reach also their 500MHZ.
Radio amateurs, especially those who make QRP transmitters or exciters, are always looking for a linear amplifier to get more RF Output.