50 Hz BASCOM-AVR stroboscope light for turntable speed check.
This project will show you how to create a simple and reliable stroboscope light for your turntable using simple Bascom code and the Attiny-25 MCU by Atmel. Here is the datasheet: – LINK
In order to complete the task we need to generate a 50Hz PWM signal using the built-in timer – Timer 0. An external crystal is used to provide the reference clock – 6.5536MHz
Timer-0 prescale is set to 256 which divides the system clock by 256 when the timer is connected. The calculations go as follows:
25.6kHz/256=100Hz – for 8bit timer
100Hz/2=50Hz – PWM value is set to 128 (50%)
As it seems NI’s new Multisim Blue is coming.
It promises some very nice features for a FREE software. Cant wait to try this one out!!! Tons of components and extensive libraries. The on-line library update looks interesting as well. I only hope that the simulation tool is as good as is the one from the non-free packages.
More info on the upcoming software – HERE
Here is a handy LM317 constant current calculator/tool. It allows you to quickly calculate the set resistor and the heatsink (is needed).
Here is my circuit adopting the famous LME49811 amplifier front-end and ThermalTrakTM
transistors. This one is a rather conventional topology but implementing some tricks to improve the performance. Read More
A JFET preamp for beginners. Simple yet elegant. Low noise.
The following is an example for a very simple and high quality JFET preamp. You can use this to amplify a very low signal sources. FET transistors are usually not used independently in preamplifiers. In most of the cases they are paired with bipolar transistors. Read More
Soft start. Speaker Protection. Speaker Delay
We have completed this module this week. It is a custom build by order of a customer. The module has many specific functions. It can be used for speaker protection, speaker delay, toroid soft start and others. Read More