Christmas Tree Lights Flasher with 7812+LM380
Basic Circuits
This is Circuit Christmas Tree Lights Flasher with 7812 for supply regulator and IC LM380 for Signal generator dirve relay on-off the lamp two set. detail other see circuit. The Christmas Tree Lights Flasher Circuit. It is Lamp flasher that interesting by use IC LM380 for Oscillator generator model Pulse Osc. Low Frequency for use relay switch give Lamp 220V. A lot of get for the accuracy of the circuit then must use IC 7812 DC voltage REG 12V And R1 use fine winking speed of all light bulb. The detail is other see in the circuit better sir. Table …
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. …
Many Constant current source circuits
Power supply
      Sometimes we need a constant supply to the load.To prevent damage to the load.For example, when we apply a voltage that ever-changing to LEDs. However,LED needs to have the constant current and voltage. As usual, we provide current limiting resistor to it. But this works we can not use because the input voltage changes all time. We must make a constant current through the LED. If you do not understand. Try to preview the circuit below. The Safe constant current source.       Figure 1 the below is a Safe constant-current source circuit, how it works?       A cmos op-amp (number ICL 7611) …