Universal power supply with switched mode modules [150464]

Originally designed as a more compact power supply for our 10 MHz DDS Function Generator the PCB can also be used with different modules for other applications.

Halfway 2014 we designed a Christmas tree shaped as an upward spiral (http://www.elektor-labs.com/project/130478-xmas-tree-2014.14097.html). The extreme high production costs (0.2 mm PCB) was the reason we didn’t make it available in our store. A variation on the original design is making use of circular PCBs with decreasing diameters placed above each other.

Design and text by Theodorou Gerasimos (Greece) A few years ago I needed a frequency generator for my laboratory. I had worked on some expensive models and initially I thought to buy one. But none of them was what I was really looking for.

By Willem den Hollander(original text) Most microprocessors have implemented a so-called Watchdog function. A counter continuously counts down either a clock generated by a separate oscillator or the main processor clock. When the counter reaches zero a reset is generated.

In this project we are interested in a Hi-Speed USB UART. The PCB is designed to be mounted on a side panel to save space. No mounting holes on the bottom are necessary nor having to mount it on another PCB first (like so many BOBs). The PCB is only 22 x 33 mm and should fit in almost any enclosure. It’s fixed with four 2 mm screws (in most cases 10 mm length should be enough).

Bij het experimenteren met analoge schakelingen op een breadboard vormt een kleine audioversterker met bijbehorende luidspreker vaak een handige hulp om signalen hoorbaar te maken. Daarom hebben we een handig T-board ontworpen dat op één kleine print een klasse-D-versterker, een DC/DC-converter en een kleine luidspreker herbergt.

Published in Elektor Magazine issue 7/2015 on page 78 Hardware usedProject PCB 150169-1

Designed by A. Rosenkränzer This 3-way filter is originally designed in conjunction with the power amplifier we published earlier (130007-1).

Up until now we only had digital T-Boards. Why not an analog one? We asked ourselves what could be a useful circuit when experimenting with an analog design. First thought was audio. How about a little amplifier and speaker so no extra cables or 3,5 mm jacks need to be connected. Also no extra speaker has to be connected, all you need is just on one little PCB.

Project is updated: look for additional information in contribution Updated version 1.1 of Power Meter 140409-1 One of our projects is the Practical 4 Channel ADC (called ADS1115-BOB in our shop, 140169-91). But what kind of applications are suitable for A/D converters with a slow sample rate.