Free electronic circuit design and schematic diagram
Below 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, […]
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This is a speech processor circuit that can be used in communication radio circuit. This circuit consist of two sections, they are amplification and compression or dipping. The combination of these processing will improve the SSB communication intelligibility and provide higher average level while avoiding clipping. The 100K pot is used to adjust the compression degree, as well as adjusting […]
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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The linearity of 555 IC is sufficient to make 1 second precision, and this circuit employs the feature in this design. This timer step circuit can generate a timing steps from 0 to 59 s in 1-s intervals. Here is the schematic diagram of the circuit :
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