Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

Do not skip bypass capacitors

If you are designing some circuits, you probably know or by intuition add bypass capacitors to every IC power rail. Almost everywhere you will find scarce info that you need to place cap as close to IC as possible. In order to get deeper understanding why these caps are needed, sana syed on electro-labs wrote a tutorial about bypass capacitors explaining the meaning of it and what size of capacitor is needed. The main reason why bypass capacitors are used is to filter out high frequency noise and glitches from DC voltage. It can be power supply or DC biasing. If you know fundamental electronics, then its clear that capacitor allows AC to pass while stops DC. So if carefully selected capacitor it passes high frequency noise directly to ground… Continue reading

Wake up with sun anywhere you are

Direct sunlight is perfect for waking up in the morning. But it happens that there is no sun or simply your bedroom is in western side of the house. Then there is the only way – start cheating with sun simulator. It is based on ATTiny13 microcontroller which takes care of dimming the 150W halogen lamp. Alarm clock can be set to reach its maximum intensity from 2 minutes up to 8 hours. Microcontroller takes alarm signals from regular digital radio alarm clock so no need to do additional time tracking. I agree it looks a bit dangerous to have halogen lamp near pillow, but it is worth to risk for a bit of sun. Continue reading

Is Paintball, Not “Painball”!

Looking forward to play the paintball game, but fear of the pain when got shot? Now, with this paintball safety system, you don’t need to afraid the pain anymore! This sophisticated paintball safety system consists of the sensor circuitry and the microcontroller code. The main purpose for this design is to ensure that the paintballs travel in a safe speed, which under 300 feet per second. The main function of sensor circuitry: Base on the “beam break” concept for triggering the microcontroller. IR diodes always in on position and will be saturated the phototransistors. It will automatically detect the balls or no balls condition, where if with ball is 4.2V while no ball is 0.1V. If timer overflows and the ball was took longer time to reach the rear sensor… Continue reading