Free electronic circuit design and schematic diagram
Bridge-tied-load (BTL) configuration in an amplifier is basically a H-network with the loud-speaker as the “bridge” between two active valve or switcher. This configuration allow a full alternating current signal to be produced at the load (loudspeaker) without a transformer or a symmetric power supply. Here are some benefits of BTL configuration: No need large capacitor for DC blocking (decoupling) […]
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Power line carrier system is common in home appliances networking. One benefit of using this kind of transmission line is that we don’t have to deal with additional wiring for data or signal communication, since all we need is already provided when we plug the power jack into the power outlet/stop contact. The circuit depicted in the schematic diagram below […]
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This circuit can be applied in digital-controlled audio application, for example to select the active input line by a micro controller. For such purpose, we can build three units of this circuit and feed their outputs into a three channel simple audio mixer circuit, and now the selection of the active channel can be done by a micro controller. For […]
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Using an RS232 port, we can generate square wave oscillation when transmitting data, and this can be “misused” as signal generator (square wave generator). This is a PC Signal generator produce a square wave in audible frequency range. This circuit utilize a transmission of a “U” character from ASCII character set. This character has binary value of 01010101, making it […]
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Tremolo circuit is a kind of sound effect. We can see this type of effect is applied in guitar effect pedals. Tremolo effect is produced if we modulate the amplitude of an audio signal. The shape of modulating signal can vary from square wave, sawtooth, or sine. When we use a square wave, then the effect produce a knocking-like sound […]
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When we connect a mono audio output into a stereo headphone (simply by paralleling it), we would hear the sound with all of its components comes from one point, and the worst, that point is located inside your head. This perception is created by the fact that the signals from the right and left earphones have exactly the same amplitude […]
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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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