Search Results for: free scr circuits
This free running oscillator employs LM111 comparator. The output of this oscillator is square wave. You can use this square wave oscillator for general purpose. Here is the schematic diagram of the circuit: [Source: National Semiconductor Application Note]
Read MoreTo extend the measurement range of an available ADC(analog to digital conveter) we can use this autoranging. If it implemented on multiplexed input, this circuit will give best result. To adjust an ADC’s full-scale range we use a system autoranging that use LTC1257 because it is appropriate for system autoranging. During …
Read MoreLight Emitting Diode or LED is suitable for ON/OFF indicator since it has high durability, almost free of maintenance. The most common usage is in low voltage application since the operating voltage is low DC. Taking the benefit of its high durability of LED in high AC voltage from line voltage can be done using …
Read MoreFading a video signal can’t be done simply by attenuating the composite signal, since the synchronization signal may drop below unacceptable level. Here a circuit to overcome the problem: Most of video signals will works with this circuit, except for very noisy or distorted signals. The rest circuit is an LT1251 video fader …
Read MoreGamma correction need to be applied in video processing since the transfer function of video acquisition and video display is non linear. Here is the schematic diagram of a gamma circuit: If gamma value equal to 1, the the transfer function is linear. Typical CRT usually have gamma factor from about 2.0 to …
Read MoreThis is true subwoofer circuit. This circuit is used for 15- to 18-inch woofers and will not work with 8- or 6- inch “subwoofers.” It has bass-reflex, a good infinite-baffle, or foldedhorn enclosure, and driven by driven by an amplifier with at least 100 watts. This circuit will most useful for home theater applications, which …
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