Electronics Workshop Royal Conservatory Den Haag, Holland

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Ewp Electronics Stereo Amplifier

Category: Ewp Projects  

Electronics Tips&Tricks Simple audio amplifier

Category: Electronics Tips&Tricks

Simple audio amplifier with a LM386.

The LM386 chip is a popular little 8 pin chip at the moment. We have a lot of questions how to make a simple amplifier with it. The LM386 does not need a lot of extra components and that's why it is so easy to work with. When you use a 9V battery and a 8 Ohm speaker, the output power (Pout) will be 0,7 Watt.

The LM386 is an analog low voltage power amplifier, specially designed to use in combination with a battery (low current). You can make a headphone amp (for stereo you need two), a small active loudspeaker and lots of other (small, low powered) audio applications. I will show and explain how you can build a mono amplifier on a breadboard and printed circuit board.

 

Ewp Electronics NachtMusic(4)

Category: Ewp Projects

I finished the electronics to drive the ‘waterfall’ for the Nachtmusic performance. The electronics switching the water pump can be adjusted to switch off the waterpump when the noise near the waterfall (people talking, music) is too loud.

The electronics consists of the following parts:
1. An opamp switched as a peak detector (measuring the amplitude of the incoming audio).
2. A comparator. Comparing the amplitude with a variable (potentiometer) dc-threshold.
3. Schmitt trigger, to avoid the relay switching on/off constantly.
4. A circuit with two transistors creating an adjustable time delay for switching on and switching off the relay.
5. The relay itself.
6. The +12V power supply with a 7812.

 

EWP News Nachtmusic(3)

Category: Ewp Projects

We tested the first bow, made bij Kees van Hemert. It’s a carbon bow newly made with metal ‘hairs' or wires. When the bow touches a string, it indirectly switches on/off the audio track linked to this string. It works really very good. You do not hear any contact pulses, but only a nice soft audio-switching. A nice concept, switching audio with old fashioned light bulbs!

To complete the electronics and the documentation, I also made an overview of the connections. Now it's also clear for other users (i hope).

 

Ewp Electronics Modular Synth Eirik

Category: StudentProjects

Eirik Brandal (student Composition) made a very nice modular synth. He made all the modules himself by hand. He used experimental printed circuit boards to construct all the modules. Nice idea! Erik did find a lot of the information on these websites:

http://www.musicfromouterspace.com
http://birthofasynth.com
http://cgs.synth.net

Very nice work Eirik!

 

Ewp Electronics VT-VFG repair

Category: Ewp Projects

Today we spend time to repair the VT-VFG of Bea-5. We did get assistance from Jo Scherpenisse, technician, and former colleague of the EWP, who designed a lot of modules, still in use in the Analog studio.

The VT-VFG did have problems with the manual (switch) shift input and the external shift input. When using the manual shit input (by pressing a button), the electronics sometimes skipped some steps. Very annoying for the users and it needed to be fixed.

 

Ewp Electronics Nachtmusic(2)

Category: Ewp Projects

The electronics for 'Nachtmusic' is finished and ready to be tested. It consists of a circuit that converts light intensity into amplitude modulation; in other words, the more intens the light bulb is lighting up, the more output volume the user will hear.

 

Electronics Tips&Tricks How to build a circuit

Category: Electronics Tips&Tricks

If you are new to electronics, but you really want to create your first circuit on a printed circuit board, read the following tips to get started.

If it is really the first time that you try to make an electronic circuit, take my advise: start with a simple small circuit.

The best circuit designs can be found online, or in old-fashioned books ;-). Nice filters, powerful amplifiers, new microphone pre-amps, oscilllators and much, much more circuits can be found. But if you do found this great circuit, HOW do you proceed?

 

Ewp Electronics NachtMusic

Category: Ewp Projects

This week I started building the new electronics for Dick Raaijmakers piece, 'Nachtmusic'. Four string instruments will be used as 'audio switches'. The original design by Dick Raaijmakers was modified and improved by Godfried-Willem Raes. http://www.logosfoundation.org/kursus/2126.html


As a part of 'Nachtmusic' there will be a small waterfall on stage! In combination with the sounds on stage this waterfall will be active or not.
Nachtmusic will be performed in the Springfestival in April 2015 at the Royal Conservatory

 

Electronics Tips&Tricks Ohms law

Category: Electronics Tips&Tricks

Ohms Law.
If you want to understand electronics and build nice cool circuits, it's important to understand Ohms' law. It's the most fundamental law in Electronics. Check the small cartoon. This shows Ohms law ;-)

With a constant pressure (U; Voltage), the amount of current (I; Ampere) in a closed loop is determined by the total resistance (R; Ohm) of that loop.

In other words: U = I x R

 

 

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