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Category: Inside Circuits Views: 4551 Rank: 2 The automatic fader drops at the background music while the narration is in place. The control input through RIO, a preset audio level control, into an emitter-follower buffer stage CQI). The buffer provides high input impedance and ensures that the source impedance is low enough to drive the rectifier and smoothing circuit, consisting of DI, D2, and C5. The smoothed output drives a simple LED circuit. LD and R8 form an IR input pad through which the output is fed through C6 and C7 to the output jack.  The output to the emitter of QI couples making this C4 and R5. R5 and R7 are a passive mixer. With 200 mV or less at the entrance, there is enough voltage on C5 to tum Q2. More than 200 mV, Q2 will turn on a boundary, and the LED is energized. This brings down the resistance of the LDR, and signal loss due to increased attenuation. Increase the input of 350 mV rms, and you get a signal reduction greater than 20 dB. Datasheet file1: Click here to download BC109.pdf datasheet.
Related circuits The sensor consists of two series-connected lN914s, part of the circuit of a 555 multivibrator. Wired as shown, the output pulse rate is proportional to the temperature of the diodes Inverting Summing Amplifier Circuit The output of Ul is the sum of Vv and multiplied by Rx/Rv RJRV and respectively. Rlj R2, R3 are selected as required for individual gains. Tachometer-and-direction-of-rotation-circuit In machine and equipment design. some applications require measurement of both the shaft speed and the direction of rotation. Fig. 56-4 shows the circuit of a tachometer, which also indicates the direction of rotation. The flywheel has two magnets embedded in the outer rim about 45° apart. One... The circuit is a two-stage, direct-coupled transistor amplifier connected as a free-running multivibrator This circuit uses LEDs to display the beat frequency of two-tone oscillators. Only one LED is on at a time, and the apparent rotation of the dot is an exact indication of the best frequency Two op amps are used as comparators to indicate excessive magnitude of an AF signal, either positive or negative, even if the signal is asymmetrical. PI sets the reference voltage for both op amps. A differential amplifier makes an excellent audio clipper and can provide precise, symmetrical clipping. The circuit shown commences clipping at an input of 100 mV. The output commences clipping at ±3 V. Matching Q7 and Q2 is necessary for good symmetrical clipping. When the output is high, R3 and R4 are in parallel, and CI charges via Rl until the current in R2 equals that a Live AV collaboration - Vj Franz K & Mk Ultra
MegaBeat Audio - Darth Fader (fade in/out pedal) [ENG]
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