Free electronic circuit design and schematic diagram
Some costly efforts have been made to shorten the waiting time for all kind of services in the call center or other business, but many customers still complaining about the long waiting time, so other solution should be taken to handle this situation. Waiting a call hold can be boring if there is only silence on the line, that’s the […]
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Relays are normally operated at current level where it can initiate the mechanical metal contactors movement. After contacts has been established, the current level needed to keep the conductor plates stay attached is actually smaller than the current to initiate it. This power saver circuit seems to have opposite mechanism of surge protector. This circuit provide surge current to initiate […]
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This is a relay circuit that detect the presence of sound to activate the relay. You can use this sound-controlled relay as voice operated switch, light control, toys, or any other application that can be controlled by a switch. Just replace the switch with this relay and now you have a sound-controlled device. This circuit uses a 741 operational amplifier […]
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Look at the schematic diagram of a circuit below, imagine if the capacitor C1 is not charged and the power is off. There will be no current flow and Q3 will be open. The Base of Q3 will be high and the Base of Q2 low. The circuit is in stable condition and nothing happening. Power will flow through the […]
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Another circuit (from Horowitz and Hill) is shown below. The circuit is almost the same except that the base of Q2 is not connected to the ground. The voltage at the emitters, Ve, is the important thing here. Q1 is off and the output goes low when the base of Q1 rises to 0.7V above Ve if the input is […]
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Triode for alternating current,TRIAC, is an electronic component that can control power in two direction in an AC circuit. The figure (a) shows the block construction and schematic symbol of TRIAC. The TRIAC is operated like two SCRs in parallel connection in opposite direction like shown in figure (b). Here is the figure of TRIAC: A TRIAC can be triggered […]
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Silicon Diode for Alternating Current, SIDAC, is a multilayer silicon semiconductor switch. This component is triggered by voltage and can be operated as bidirectional swtch. Usually, this SIDAC is used in cheap high voltage power supply or ignition circuits. Figure below shows SIDAC block construction, schematic symbol and geometric construction : The SIDAC has leakage current(Idrm) less than 5 µA […]
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