Professional solid state relay circuit
Controls & Timers
A solid state relay circuit that in common use design to be controlled by the input voltage from 3V to 24V. However, in actual usage. We found that at low input voltage. Performance of the circuit is decreased. Because the most input circuits will be using the resistor to control the current flows through the LED transmitter. On as low-voltage doing the current is very small, so that the output circuits to drive the triac gate current reduced, the current flowing through the load decreases. If the lamp is a load, it is obvious that The lamp does not light …
Simple High power LED flashlight
Lightings
This is simple hight power LED flashlight,we use 24 LEDs super bright for display and 3 AA batteries and resistor for limit current so cheaper. My son buy this LED flashlight but is low light. Thus, he want to builds the new high power LED flashlight with himself. How does it works We use the 24 white super bright LEDs. As circuit diagram in Figure 1. They are connected together in parallel. The each LEDs need to use the voltage about 3.3V – 4V at 20mA current. It makes LEDs uniform brightness, but use all current are 0.4A to 0.6A. …
Simple big robot toothbrush
Hobby Electronic Projects
Today, My son make a toy for younger sister. It is a Simple big robot toothbrush. The principle is very simple, It vibrates with movement, without direction and control. He took it to play with the cat great fun. Figure 1 the Simple big robot toothbrush He uses all old parts. – The power source is a AA batteries 1.5V x 2 = 3V. Because he uses a DC motor in a toys. Which, it uses voltage about 1.5V – 4.5V. – ON-OFF Switch, we use a small switch. – All parts is hold on the plastic board with glue. …