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Preamplifier 2012 (1) - introduction and line-in/tone/volume board (110650)

by ClemensValens
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Audio lovers, sit up. Besides presenting a truly high end audio control preamplifier for home construction, this article series also aims to show how low-impedance design and multiple-amplifier techniques can be used to significantly reduce the noise levels in analogue circuitry.
14440 views | 22 comments
Q-Watt - Simple Audio Power Amplifier (110656)
Staff pick
Product available

Q-Watt - Simple Audio Power Amplifier (110656)

by TonGiesberts
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Simple audio power amplifier A kit with the PCB and all the needed components (except
36263 views | 83 comments
230V AC dimmer, mains isolated, using P12F629

230V AC dimmer, mains isolated, using P12F629

by DanyR
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This is a very simple mains isolated dimmer with a triac output (phase control). It uses timer0 to do the timing.
4654 views | 22 comments
New Software for Network Connected Signal Analyzer
Product available

New Software for Network Connected Signal Analyzer

by BreedJ
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I recently bought the Network Connected Signal Analyzer from the Elektor shop.http://www.elektor-labs.com/project/network-connected-signal-analyzer-150211.14581.html
2525 views | 23 comments
Platino Soldering Station [140107 ]
Product available

Platino Soldering Station [140107 ]

by Sunil_M
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A simple Platino based soldering station for not too demanding (hobbyist) applications. Temperature range of 90 – 450 degrees Celsius with temperature readout on an LCD.
16023 views | 58 comments
raspberry pi internet radio

raspberry pi internet radio

by raarts
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Internet radio using the raspberry pi
51 views | 0 comments
MAXREFDES99# LED Shield Experiments [160267]
Product available

MAXREFDES99# LED Shield Experiments [160267]

by ClemensValens
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Software for the Maxim MAXREFDES99# Display Driver Shield, an Arduino & ARM mbed compatible shield with a 16x16 LED matrix on it.
76 views | 0 comments
Weather Display

Weather Display

by Nickelgrass
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This is a stand alone WiFi weather display that also features UV and moonphase data. It is powerd by an ESP8266 with custom firmware an an AVR.
2521 views | 7 comments
UV Exposure Unit with built in PIC-based timer

UV Exposure Unit with built in PIC-based timer

by Steveg0
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The idea of using Ultraviolet LEDs to expose photo-sensitive circuit board is not a new one but with this design I hope to provide a solution with consistent timed exposure using very simple circuit construction, downward exposure and using off-the-peg boxes to house the unit. In fact, everything has been designed with the home constructor in mind.
8013 views | 3 comments
OBD2 for Raspberry Pi

OBD2 for Raspberry Pi

by Thomas Beck
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OBD2 for Raspberry Pi with Pi-OBD add-on board or DXM OBD2 module and OBD2 software taken from my other labs project Firmware Update for OBD2-Analyser NG.
10089 views | 0 comments
Card Sound

Card Sound

by fasoft
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Play sounds stored onto SD card with 2x 7W output power.
170 views | 4 comments
Upgrade Magic Eye EM84 to Windows10

Upgrade Magic Eye EM84 to Windows10

by cvdo
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This Elektor-project from 2010 uses an EM84 magic eye to display the cpu usage of a pc. Great, but it doesn't work any more under Windows 10 :-(
2912 views | 6 comments
AUDIO CLASS-D POWER AMPLIFIER

AUDIO CLASS-D POWER AMPLIFIER

by sequencer
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Simple, single-channel, low-cost, high-efficiency, high-performance audio class-D power amplifier.
4716 views | 22 comments
Wireless High Power Transmission [160119]

Wireless High Power Transmission [160119]

by TonGiesberts
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For those who like to experiment with wireless power transfer this circuit can deliver almost 50 W at an efficiency of 88 % (supply voltage 12-24 V).
7789 views | 6 comments
Magic Eye CPUshow for Windows 10

Magic Eye CPUshow for Windows 10

by JDJK
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Modify MagicEye CPUshow for Windows 10
180 views | 2 comments
Solar charger for smartphone:

Solar charger for smartphone:

by gfaman
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How a small solar panel can recharge a smartphone through the USB plug:
3505 views | 4 comments
Bluetooth Relay on the Elektor-Labs Prototype Board ELPB-NG (150180)

Bluetooth Relay on the Elektor-Labs Prototype Board ELPB-NG (150180)

by raarts
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I came up with this project because a colleague of mine wanted an easy way to control his three garage ports, so I thought it would be nice to control it with an Android app via Bluetooth.
3123 views | 8 comments
Versatile Switch Mode Power Supply PWM Controller [ 150100 ]

Versatile Switch Mode Power Supply PWM Controller [ 150100 ]

by Mickael.Delayen
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Although SMPS (switch mode power supplies) can take various structures (Buck, Boost, Flyback, Forward, etc.), they are always based o
5686 views | 5 comments
Elektor Uno R4 [150790]
Staff pick
Product available

Elektor Uno R4 [150790]

by ClemensValens
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This board is an evolution of the Arduino Uno R3 board. Identical form factor as the Uno but based on the ATmega328PB-AU, this board has many more features than the Uno. Because it is backwards compatible you can think of it as revision 4 of the Uno, which is why we called it the R4.
12415 views | 55 comments
Accessory of programming

Accessory of programming

by ProfTourn
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If you need to create a circuit of small size with a microcontroller to be programmed, the programming connector size will be a handicap. The install
113 views | 0 comments
Open-source ELM327 OBD adapter

Open-source ELM327 OBD adapter

by asidorenk
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The adapter allows you to interface with your car's OBD-II bus using the ELM327 command set
117 views | 0 comments
Latest comments
Calpe
Calpe 4 hours ago
C11, C38 = 4.7 pF, +/- 0.25pF, 100 V, lead spacing 5 mm is not available in Farnell. Maplin U.K. have a Metallised Ceramic Plate 4.7pF Capacitor, Code: WX40T, which should be suitable.  It's a 'miniature ceramic capacitor with a cement-coated case. It is suitable for temperature compensation in tuned circuits where low losses, close tolerance and high stability are required.'
Preamplifier 2012 (1) - introduction and line-in/tone/volume board (110650)
ClemensValens
ClemensValens 6 hours ago
On the photographs in the articles you can see what was used in our prototype: mainy single-row pin headers, I see a double-row pin header and 2 box headers. I gave you the references before, here they are once more: Terminal block is something like Farnell 2067355 Pin header is something like Farnell 1098454 Pin socket something like Farnell 9728856 Box header is something like Farnell 1654504 Double row pin header is like Farnell 1098460 You need plenty of jumpers, for instance Farnell 1740371 Box Headers mate with things like ribbon cable sockets, f.i. Farnell 1788710, that get pressed on a flat cable. On GitHub you can find the Elektor Labs Preferred (ELPP) list that contains Farnell & RS references for many parts that we use.  
Preamplifier 2012 (1) - introduction and line-in/tone/volume board (110650)
Quenton Jones
Quenton Jones 7 hours ago
It's not going to save any money... but if you are in the UK you might ask Terry at Canterbury Windings to make your toroid. Including electrostatic shield. He has a really compact 432 VA toroid with shield < 132mm diameter.
Q-Watt - Simple Audio Power Amplifier (110656)
geralds
geralds 18 hours ago
Hi, yes indeed; i know it. But, i think that's better you don't isolate this on the "hot" side the way to the TRIAC, but that you isolate this to the "cold" side to the logic. This is much more easier in handling. You'll need just an opto coupler or LWL for remote controlling the µC. Gerald ---  
230V AC dimmer, mains isolated, using P12F629
BreedJ
BreedJ 19 hours ago
You are right Rich. The thing is that I was in the middle of another project I've posted on this site later (10MHZ GPS assisted reference) when I started changing the signal analyser software. At some point I wanted to finish the GPS reference project, so this one was put on hold. I'm still very busy with that project. I'll try to contact Neal to ask if we can add some functionality like the bootloader. Its all a time problem. I need longer evenings so I can spend more time on these projects ;-). One problem is that if we manage to get the bootloader working, all who already bought a signal analyser still need to use a programmer to load the bootloader for the first time. Also the boards which are in the elektor shop will have to be sold with that firmware. Otherwise there's no point in making it because only who have a programmer are able to use the bootloader. That doesn't make sence. I do not know if elektor is planning to use the new firmware when its ready. 
New Software for Network Connected Signal Analyzer