I wanted a small yet robust amp for practicing while I travel. I wanted something that would fit in my pocket yet still be loud enough to hear. Presented here is a amplifier based upon the LM386 Audio Amplifier. There is a standard circuit in the data sheet that is an excellent place to...

I'm trying to design a superhet radio receiver that can be built up in sections, and now I met some problems. The receiver is based on the AN602 double-balanced mixer IC, with the big brother of the ZN414 (the 10-transistor radio chip), the ZN416, employed as an IF amplifier, coupled with a...

I made some changes to also support a microphone In this articlel, I will demonstrate how audio (music or sound) can be transmitted over a light beam generated by a LED. This project includes 2 parts: The transmitter, that takes the audio and modulates it using the LED The receiver, that...

I preferred AVRs/ARMs may wonder why now I want to know something about PICs. Though one may like them or hate them, they offer many advantages at [very] low prices (CANbus and Ethernet, RTCC, many I2C & SPI & UART ports). Finally they seem to be among some of the most widely MCUs used in...

I have worked with PIC16 and PIC18s for over three years now and would like to get to know AVR as well. I have no specific project in mind, but would like to try around with the different architectures. I'd like to get a compatibility report on PIC and AVR. uC's software I am familiar with...

Hello! I have a TDA2030A based amplifier that should make a decent headphone amp except that its gain, at about 32 dB, is way too high. It would be easy to change the gain setting resistor or even put in a switch to change the gain from say 10 to 15 to 20 dB for proper Headphone use. But there...

I am using the TI chip TPS65930 along with a small 33OHM speaker which is also utilized as a mic by simply speaking into it. I have a few questions regarding this IC that I hope some of you can help me out with. SPEAKER CONFIGURATION: According the data manual on page 56, I am shown that the...

Hello, very happy to be a member. My project on STM32f407-Discovery. I will send a message on terminal to my board and I use this message for showing an 8-digit display. I am trying to build a look up table for the 8 digit Display. I will use it for counter but I don't know where am I starting...