DavidI have the cheap version PCR machine completed, so here is the new parts list:
| Microcontroller | Atmega328p | $2.30 |
| 3.3V Regulator | MCP1700T-3302E/MB | $0.37 |
| 2x 0.4C Temp sensors | LMT86QDCKTQ1 | $0.60 |
| 2x 11W 10ohm heating resistors | SBCHE1110RJ | $0.78 |
| 2x 4A N-Mosfets | TSM2310CX | $0.80 |
| Capacitors and Resistors | various | $0.50 |
| aluminium extrusion | as described | $0.50 |
| 12MHZ crystal | XTAL003210- HC49/4HSMX | $0.27 |
| Paperclip | $0.05 | |
| USB mini connector | $0.45 | |
| Custom 2-layer PCB | purchased in bulk | $0.70 |
The parts are commonly available and prices are good estimates for buying at single quantities You will just need a 9V 3A power supply to complete the project. That's a sum total of just $7.32, if you are buying single parts.
Moving to an ATTINY design would save about a dollar, and hand soldering on a 5x7cm perfboard a further 40 cents, lowering the cost to about $5.92, which I'll hope you will allow me to round down to the target price of $5 :) However, sticking with a custom PCB and buying a batch to make 100+ PCR machines, the price starts approaching $4.
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