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Digital Audio Sinewave Generator, a project draft
Lately, I needed to build an audio sinewave generator to produce, as a first step, 30 frequencies around the ones listed below (18 KHz to 615 Hz):   18,000 15,500 13,500 12,...
Thursday, 13 February 2020 - 12:30
Overvoltage Protection for AC-DC supply (SMPS)
This project helps in extending the upper voltage rating of an SMPS (for example, 24V/1A) from 250 Vrms to 380 Vrms while increasing its lowest voltage by about 4V only (for...
Friday, 7 February 2020 - 14:55
Overvoltage Protection for Low Power SMPS
Lately, I needed to extend the upper voltage rating of an SMPS (24V, 1A) from 250 to 380Vrms. So I added to it a circuit in series to act as an active high-voltage zener.   I...
Thursday, 6 February 2020 - 12:58
Controller for 8 AC LED Strips on a Christmas Tree
It happened that some local retailers imported, from China, LED strips made for 220V (50Hz). One strip could have a length of 1m, 2m, 3m... etc. But it (as a single LED) has...
Monday, 16 December 2019 - 18:57
Six-Input AC Voltmeter
Hi, Lately, I built this voltmeter, having six inputs, as an in-house tool (at workplace). It measures the tap voltages of a transformer of a mains relay-stabilizer (having...
Wednesday, 18 September 2019 - 11:03
Quiz for fun, two I/O pins and 16 levels
On the thread https://www.avrfreaks.net/forum/quiz-fun-io-pin-and-4-levels we found out that, by adding two external resistors (pull-up and pull-down), an I/O pin (as of ATmega8)...
Sunday, 14 July 2019 - 00:56
Quiz for fun, I/O pin and 4 levels
Let us assume; we like to monitor on a scope the timing of 4 stages while an MCU code is running. But one I/O pin only is free for this task.   As we know, an I/O pin (as of...
Thursday, 11 July 2019 - 17:59
Simple Way to Check Wire Continuity
Please note that this subject may interest some members only. And I am not sure if what I present here is new or not.   Lately, I had to check the continuity of each wire of...
Wednesday, 27 February 2019 - 23:16
Parallel Programming Procedure of ATmega328P
On the datasheet of ATmega8, there is a section for “Parallel Programming”. This section is not provided on the datasheets of ATmega328P that I downloaded lately. Do you think the...
Wednesday, 31 October 2018 - 14:02
To graduate students in telecommunications
I am just curious to know if, at the today’s universities, the following statement is still valid. "Demodulating a single side-band suppressed carrier signal (SSB-SC) is much...
Sunday, 21 October 2018 - 11:17
MCU EEPROM and Lock Bits
Just to be sure, isn’t true that it is not possible locking the MCU flash memory (of code) without locking with it the internal EEPROM? In other words, it is not possible reading...
Wednesday, 25 July 2018 - 16:00
0-5999 to 0-99h:59m
Lately, I needed to convert 0-5999 to 0-99h:59m. The operation requires a division by 60; the dividend in minutes, the result in hours and the remainder in minutes. Instead of...
Saturday, 21 July 2018 - 00:24

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