40 Watts Hi-Fi Music System
Stereo Music player with Tuner, 1986, LED VU meter and Analog VU meter.
This was done as repairing home electronics was my hobby in school days, I learnt by building Amplifiers based only on transistors from the Old Philips Circuits and Books.
Home Made Circuits
The above one is TDA2020 20 Watts Per Channel, with LED input level meter and moving-coil output meters. It would have a 5 pin din input and RCA speaker output, input for phono, tape, etc. The Speakers had a woofer, tweeter and midrange with passive crossover network.
Stereo Adapter for Portable Music Player
Low Cost Stereo Adapter 20 Watts for Portable Music Player 1984, Bass Treble and Presence.
This was a TB810 based 10+10 Watts Stereo Amplifier with LM381 or 2 Preamplifier, The portable player docks in a wooden cabinet. There was no IR, Wi-Fi or Bluetooth in those days, so the device would interface with amp thru a stereo ear-phone socket-jack system with a shielded cable. Bass, treble and Presence as per an old phillps audio amp book.
Designing Bipolar Transistor Audio PreAmps, Designing JFET Transistor Audio PreAmps, Designing Op Amp IC Audio PreAmps, Switching Regulator Basics, Using Transistors As Switches.
RASON Projects Page – Amateur Radio
- 10 Amp, 13.8 Volt Power Supply
- 12 Volt Gel Cell Charger
- Thermal Fan Controller
- Transistor Audio Amplifiers
- 12 Volt Gel Cell Charger
- Switching Regulator Basics
A Potpourri of Audio Amplifiers By N1HFX
“I intentionally avoided the use of IC amplifiers to provide a real learning experience for audio amplifier design. Although many IC amplifiers provide excellent performance at low cost, we need to learn the basics first. I will address IC audio amplifiers in a future article.”
The Radio Amateur Society of Norwich
P.O. Box 329 – Norwich, Connecticut 06360
Large stockist and supplier of electronic components throughout the world. The Electronic Components and Semiconductor Superstore.
Integrated Circuits, LED’s / LCD’s, Connectors, Microcontroller Boards, Hardware, Project Boxes, Stepper Motors.
Futurlec Semiconductor Superstore
“Orders from hobbyists and single part orders are most welcome. We do not have any minimum order charge and we welcome all customers from anywhere in the world.”
Mini Boards – Futurlec
These small compact boards are ideal to enhance your control system or development project. Add new functions and expand the functionality of your system, with a wide range to boards to choose from, including MP3, Real-Time Clocks, Keypads, RS232, RS422, Flash Memories, SD Cards and many more.
1133 Broadway, Suite 706, New York, NY 10010 USA