Free electronic circuit design and schematic diagram
This is component placement video tutorial. In this video tutorial, how to place the component is described. To place component to the PCB, the component can be dragged into work place. The component can be rotated on workplace. Each component should close each another, so the size of PCB can be reduced. Here is the video:
Read moreThis is attach footprint video tutorial. This video describe about how to attach footprint. To attach footprint, select the component then edit the footprint of component. We can add the custom footprint into the component. Here is the video tutorial:
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When audio is detected, the output is push-pull and consumes less than 3mA (with no signal) but drives the earpiece to a very loud level. It’s extremely difficult to set up because the whole circuit is DC coupled. Basically you don’t know where to start with the biasing. 8k2 between the emitter of the first transistor and 0v rail and […]
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Using this circuit, we can make animated LED for bike turning signal. The Led will blink from the right (LED 1) to the left side (LED 5). You must build the second unit to give the complete left and right t urn signal. For the right turn signal, arrange the LEDs so they blink from the left to the right […]
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Three separated LEDs is used on this battery monitor circuit. For red LED, it’s turn on from 6v to below 11v and turns off above 11v. For the orange LED, its illuminate between 11v and 13v and turns off above 13v. The green LED illuminates above 13v. This battery indication is suitable for monitoring your car battery condition. Green indicate […]
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This is Adjustable Constant Current Regulator circuit. This circuit can be used in a bench power supply to prevent the circuit that are tested from being damaged. This circuit can be adjusted to any value from a few milliamp to about 500mA. The max current is 500mA because it is the limit of the BC337 transistor in the current-limiting part […]
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This is Simple Code Lock circuit. This circuit will turn on a relay when the 8-way DIP switches receives the correct code. Here is the schematic diagram of the circuit: There are two different types of DIP, they are piano-key DIP sw and 8-way DIP sw. This circuit will not draw the current if the switch is kept off. This […]
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