Design Requests

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Displaying 1 - 10 of 20
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.
Category: 
Power Electronics
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.
Category: 
Tools
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
Category: 
Sound & Music
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.
Category: 
Power Electronics
- 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
Category: 
Power Electronics
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
Category: 
Tools
Take signal from an un-amplified instrument and boost it to stereo headphone levels.
Category: 
Sound & Music
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.
Category: 
Power Electronics
A constant current source capable of outputting a consistent current. Have all power entry and exit broken out through terminal blocks.
Category: 
Power Electronics
Using a Wein Bridge oscillator, generate a buffered adjustable sine wave output.
Category: 
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