Invoice ID:	252302
Amount paid:	$350.00
Pay date:	15 Jun 2009

Technical skill: Communication: Creativity: Timeliness: Overall:

No comments given

Professionalism: Communication: Instruction clarity: Recommend: Overall:

Tom is a very easy to work with employer. He is quick to respond to email and is clear with his goals and requirements. I hope to get future work and would recommend him to other contractors as an employer.

 

Hello, I have been working on an auto ignition system that is PIC driven. The system is an upgrade to a vehicles stock coil-pack setup, and uses coil-on-plug sticks. The PIC modifies the dwell time from the stock dwell signal output by the car to suit the new system. Initial... Show all

Hello, I have been working on an auto ignition system that is PIC driven. The system is an upgrade to a vehicles stock coil-pack setup, and uses coil-on-plug sticks. The PIC modifies the dwell time from the stock dwell signal output by the car to suit the new system. Initial testing has been positive, however, there is an occasional miss-fire and associated erratic tach signal. The tach is driven by the PIC also. On a bench test with a pulsed 50ms signal, it has shown that the ECU occasionally misses one of the triggered signals, and at times, the PIC stops working. This may be a crystal issue, or a combination of things. I am no expert in circuit design, and would like this design double checked and given feedback on what changes need to be made. I would like to sell these kits, so I am looking for help to ensure it's perfect. After receipt of NDA, I can provide the PCB design, component list, and whatever else you should need. Thank you, Alex Show less

Invoice ID:	255528
Amount paid:	$200.00
Pay date:	15 Jun 2009

Technical skill: Communication: Creativity: Timeliness: Overall:

No feedback published

Professionalism: Communication: Instruction clarity: Recommend: Overall:

No feedback published

 

We currently manufacturer a communication device that reads instruments that have a 0 to 5vdc output. We have a client that wishes to measure induced AC voltage with our device. So, we require a small circuit that can covert induced AC voltages to a 0 to 5vdc output. The min/max... Show all

We currently manufacturer a communication device that reads instruments that have a 0 to 5vdc output. We have a client that wishes to measure induced AC voltage with our device. So, we require a small circuit that can covert induced AC voltages to a 0 to 5vdc output. The min/max range of induced AC is 0 to 100 volts. The circuit would be connected to a metal structure via 18 awg wire where the potential for induced AC voltage would exist. As induced AC increases, so will the 0 to 5 vdc output voltage. Output side of the circuit is connected to a 0 to 5vdc input channel on our existing communication device. We have a limited supply of DC power on site so we would prefer a circuit that uses minimal power to make the coversion in a short amount of time. This circuit can be turned on and off by our self powered device so we do have some control over power consumption. The circuit must be DC powered. Our plan is to manually build a few pcbs for testing then possibly move into smt components at a later date. Deliverables: 1. Schematics. 2. Bill of materials - using readily available through hole components Show less

Invoice ID:	248071
Amount paid:	$400.00
Pay date:	26 May 2009

Technical skill: Communication: Creativity: Timeliness: Overall:

Excellent

Professionalism: Communication: Instruction clarity: Recommend: Overall:

John is a very easy to work with employer. He is quick to respond to email and is clear with his goals and requirements. I hope to get future work and would recommend him to other contractors as an employer.