Crystal Pulling Schematic Circuit Diagram

In microcontroller circuits, quartz crystals provide the highest accuracy for keeping everything on frequency. With frequency and time measurement (and for commissioning master clocks) fine adjustment of crystal oscillators may also be necessary, so we will now investigate in detail how crystal frequencies can be ‘pulled’. Although we have taken the ATtiny25 AVR microcontroller from[…]

Read more

SW Converter for Digital AM Car Radio Schematic Circuit Diagram

This circuit is purposely presented with many loose ends (not literally, of course) to stimulate experimenting with RF circuitry at a small outlay. Looking at the circuit diagram you may recognize a modified version of the SW Converter for AM Radios described elsewhere in this issue. The modifications were necessary to make the circuit compatible[…]

Read more

Simple IR Receiver Schematic Circuit Diagram

This circuit has been designed to complement the ‘Simple IR Transmitter’ and to decode its transmitted signals. The similarity to the transmitter can be clearly seen: the received data is decoded by a shift register (74HC4094), which again is clocked by a counter/oscillator (74HC4060). The receiver is started by the first edge from the IR-receiver[…]

Read more

Squarewave Oscillator Using TLC073 Schematic Circuit Diagram

The new range of low-noise, highspeed, and low-distortion BiMOS opamps from Texas Instruments, type TLC070 to TLC075, is intended for use in instrumentation, audio, and automotive applications. This oscillator is an ideal example of its application: a stable, highly accurate squarewave at frequencies up to 60 kHz can be produced with an output current of[…]

Read more
1 2 3