User:Srokebep/ENES-100/project 1

Top three projects in order

 * power supply
 * cavitation
 * goldberg

Week1 Narrative
https://www.circuitlab.com/circuit/zp64qr/powersupplytester/
 * this is the /cdio/ page for this project.


 * I need to figure out the poles of the mosfet


 * 1 is the base, 2 is the emitter. 3 is the collector (case)
 * The collector is the casing because along with heat sinks it helps to eliminate the heat that builds up when operating.
 * took inventory of parts we are missing a few things we will have to come up with alternative solutions
 * I started to assemble unit
 * see /cdio/ for solution to this problem
 * I need to mount transistors to heat sinks
 * I need a 35 ohm pot, but we have a2k ohm pot that might work
 * I have built everything up to the transistors and heat sinks and 35 ohm resistor

Week2 Narrative

 * I cleaned the heat sinks so the transistors can bond better with the heatsinks
 * I drill the holes for the transistor post with a 3/32" drill bit
 * I drilled the holes to mount the transistors with the 3/32" drill bit and tapped the hole with a 1/8 tap
 * I mounted transistors to first heat sink


 * I removed glue that someone else put on the board
 * I drilled holes to mount heat sinks to board

PROBLEMS

 * I built a quick circuit on circuitlab to get 10 amps so we can test meter and it blew the 1.2 ohm resistor 10a circuit
 * Video of test


 * I need to think about to power levels in this circuit.
 * I need to find out the total resistance of the circuit.
 * Amp meter might have to be step down in current in proportion to the circuit, ex.1/50
 * Re-evaluate circuitlab tests
 * meter test

Week3 Narrative

 * Wired unit

Need to do next and Concerns

 * Wires from collectors to .3ohm resistors need to handle 15A min.
 * They need to go straight from collector to resistors, not thru bread board.
 * All wires on power resistors need to be sized up.
 * All wire on or to bread board should be solid, not twisted wire, for better connection in bread board.
 * Holes on face of casing needs to be made bigger to fit 2k ohm pots.
 * Notches have to be installed for pot mounting, to stop them from spinning.
 * Terminals have to be installed in order to hook up what is being tested.
 * Depending on op-temp, cooling fans might be needed.
 * Once amp gauge is finished install it.

New Meter
The volt meter that was being converted to an amp meter got burnt up so I had to find a new one.this will be coming out of an old photometer. I tested the meter and it has an internal resistance of 900 ohms.
 * meter is out

ton of meters

Week Four
This is a /tutorial/ for building a power supply tester.