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Design Requests

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4 Channel Basic Relay Driver

4 channel relay board. Use relay 11.001. Use screw terminals for all connections. Have an LED indicator for each signal. Have 5V supply for relay coils. Circuit can be as bare-bones as possible (IE no protection (fuses), and no filtering). HOWEVER please include diodes to protect the MOSFETS.
Submitted by Shane Oberloier on 30 Nov 2017 - 00:34.
Category: 
Power Electronics

Terminal Arduino

A simple Arduino clone with terminal block breakouts. Center it around the ATMEGA328-PU (UPL 9.002). Include a 5V power supply, and one indicator LED (with disconnecting jumper). Add reset button and ICSP headers. Use internal resonator. FTDI not necessary - but future version it might be handy
Submitted by Shane Oberloier on 29 Oct 2017 - 02:18.
Category: 
Tools

MIG Welder

We need a trigger, gas, and wire feed circuit for https://www.youtube.com/watch?v=z35BYaCRRhM The gun tip appears to be live, so no contactor is used inside the gun. This makes it a very simple but robust design.
Submitted by marcin_ose on 2 Nov 2017 - 23:16.
Category: 
Tools

Desktop Audio Mixer

A device that mixes two or more analog audio signals into one analog signal, Does so via multiple inputs with dimmer switches for individual volume control. It should be Audiophile/Studio Quality Sound (I.E Low Noise). Can be either banalced or unbalanced. Is a part of this OSE construction set: http://opensourceecology.org/wiki/Open_Source_Audio_Capture_%2B_Editing_%2B_Reproduction_Construction_Set On this page: http://opensourceecology.org/wiki/Open_Source_Desktop_Audio_Mixer
Submitted by Eric Lotze on 12 Dec 2017 - 22:06.
Category: 
Sound & Music

240VAC to 24VDC Charger

Smart charger that goes from 240 AC to 24V DC lead acid batteries. The equivalent commercial counterpart is https://www.ebay.com/itm/24V-5A-Jazzy-Power-Chair-XLR-Mobility-Smart-Charger/331199313251. This is currently used as a backup charger for the Seed Eco-Home as we test the overall PV system.
Submitted by marcin_ose on 17 Dec 2017 - 22:45.
Category: 
Power Electronics

Pure Sine Wave Generator

Using a Wein Bridge oscillator, generate a buffered adjustable sine wave output.
Submitted by Shane Oberloier on 29 Oct 2017 - 02:43.
Category: 
Uncategorized

Open Source PC Power Supply

- Should resemble what is called a "Fully Modular Power Supply" Meaning no cords are permanently attached - AC or DC Power In - Around 500W level Here is the OSE Page: http://opensourceecology.org/wiki/Open_Source_PC_Power_Supply_Unit
Submitted by Eric Lotze on 1 Jan 2018 - 09:02.
Category: 
Power Electronics

Headphone Amplifier

Take signal from an un-amplified instrument and boost it to stereo headphone levels.
Submitted by Shane Oberloier on 29 Oct 2017 - 02:27.
Category: 
Sound & Music

24V Power Supply (AC to DC)

An AC to DC converter taking 120V, and turning into switched DC. The design can be based around the MC34063ABN (UPL 5.009). Design for maximum current output.
Submitted by Shane Oberloier on 29 Oct 2017 - 02:33.
Category: 
Power Electronics

Small Electric Fence Charger

Solar/battery powered, large enough for a *small* fence i.e. 50ft, not 10000 like most chargers. These would be really useful e.g. when keeping animals away from a single fruit tree. Commercial chargers are just too big/expensive for these usages which I think would be very frequent if the charger were available.
Submitted by steve.steiner on 4 Dec 2017 - 04:31.
Category: 
Sustainability

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