Fixed Price: Less than $500
| Posted: Apr 20, 2015 | Ends: 8d, 16h |
OVERVIEW I have a schematic diagram for a electronic stimulation system, meant for applying electric fields to different types of materials ranging from liquids to soils. The implementation is very simple, consisting of an 5V Arduino pro-mini module, with 3 different pin outputs going to a connector. Each output is different. One puts out 5V, another does 3V via a voltage divider, and the last one has a RC filter on one of the PWM ports. I also have 4 LEDs, 2 switches, a CdS light sensor and a power jack. I developed the schematic myself along with some help from some engineering mentors, but need help with validating portions of the design, namely the current buffer and ESD protection stages. I also need to make some minor changes to the board, e.g. Adding a push button. DESIGN When I prototyped the buffer output using a Npn current-follower, I couldn't see my source waveform showing up on my scope. Maybe I made a measuring mistake, but need validation from someone more ski...
Fixed Price: $500 - $1,000
| Posted: Apr 20, 2015 | Ends: 8d, 13h |
Design the output stage of a transformer coupled pulse readily available off the shelf components (This does not include the design of the transformer itself. that must also be readily available). I will provide the existing drive circuit and output pulse waveform. Deliverables: 1) a working prototype 2) schematics 3) Bill of materials and non-standard component Data sheets. 4) Thorough documentation in grammatically correct English. Must be in the US. No out of country candidates will be considered.
Preferred Location: United States