!!! September 17, 2016 Well, what do you make? I often design a circuit such as voltage, current, frequency, temperature, humidity, and barometric pressure. Again, initially trying to make products using such circuits. !!! September 22, 2016 What to do the price of products handled? First of all, I think trying to make things cheap amount of money. Although high even greater profits, greater funds to be introduced earlier. Investment is a risky large. So first make a product of a small small amount. {{include_html amazon_match}} {{adsence}}