Free electronic circuit design and schematic diagram
Below is video tutorial about automotive ignition coil. The coil is composed of primary and secondary circuit. The primary circuit is consist of two terminals. It’s connected to the steady 12 volts battery and ignition module or ECM. The secondary circuit is connected to the spark and carry a high voltage. The ECM module will always looks for returning voltages […]
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Remote sensor might cause a trouble if it’s a passive type, has very low power output, and should be connected with relatively long cables. By supplying a current or voltage source through its connection wire, it’s possible to make long enough wiring without suffering much noise/interference. The following schematic diagram show a circuit consist of LM10 to make a remote […]
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A low-loss way to implement a”glitch-free” battery backup for a memory or similar circuit is shown on the following schematic diagram. To make LT1020 does not conduct under line-powered conditions, we have to arrange the feedback string. The line LT1020 begins to go off when the lie goes down, which allows the battery-driven LT1020 to turn on and maintain the […]
Read moreBelow is video tutorial about O2 or Oxygen sensor heater. On the Oxygen sensor, there are two wire with the same color. One color for O2 heater (+) and the other is O2 Heater (-). Oxygen sensor heater will always controlled by ECM but the control circuit will very depend on the manufacturer. There are 3 ways of the ECM […]
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In furnace operation, it is necessary to make sure that the fuel or gas is ignited properly by detecting the flame. If there’s no flame detected, the situation can be dangerous if the furnace is flooded with explosive gas, so the fuel/gas supply valve should be closed automatically to avoid catastrophic disaster. A thermocouple can be use to detect flame, […]
Read moreBelow is video tutorial about automotive knock sensor. A knock sensor is basically a microphone connected to the engine block. This sensor is tuned in specific frequency. There’s a crystal inside the sensor. Knock sensor may have one or two terminal. With only one terminal, the sensor is grounded. With two terminals, one is ground, and the other is the […]
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Laboratory power supply is characterized by its wide adjustable voltage range and its robustness. Continuous voltage adjustment is necessary, as well as current limiter for safety and robustness. You can build suitable one using LM10 op-amp and voltage source IC as shown in the schematic diagram below: The output voltage is adjustable between 0-50V, with 1A maximum current. [Circuit’s schematic […]
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