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Category: Inside Circuits Views: 2397 Rank: 0 A TL081 op amp is used as a high impedance to low. converter and a signal mixer. The input impedance is about 1 megohm and the output impedance is about 1 kohm. Two 9 volt batteries are used as power source.  Battery must be several hundreds of hours with alkaline batteries. Datasheet file1: Click here to download TL081.pdf datasheet.
Related circuits This circuit provides a means of detecting the presence of anything by the reflection of infra-red light and provides a direct digital output of object detection. By the use of modulation and high power bursts of infra-red at a very low duty cycle, a detection range of over a foot is achieved The ratio of capacitors Cl and C2 determines division. With a positive pulse applied to the base of Ql, assume that Cl = C2 and that Cl and C2 are discharged. When {31 turns off, both Cl and C2 charge to 10 volts each through R3. On the next pulse to the base of Ql, Cl is again discharged but C2... Driver circuit uses an MC74LS04 and one discrete transistor This single-chip circuit adjusts its audio gain according to the ambient noise picked up by the microphone. When This circuit derives 5 Vdc from 2-AA cells—even at their end-life voltages of 1.05 V, and is approximately 80% ef Carrier-Current Baby-Alert Transmitter Circuit The baby-alert transmitter is built around an LM324 quad op amp (Ul), two LMC555CM CMOS oscillator/timers (U2 and U3), and a few support components. The transmitter sends a signal on receipt of a sound at MIC1. This circuit is one section of an octave equalizer used in audio systems. The table shows the values of CI and C2 that are needed to achieve the given center frequencies. This circuit is capable of 12 dB boost or cut, as determined by the position of R2. Because of the low input bias current of... The SillOO series circuit input is connected to a capacitive field sensor-possibly a piece of doublesided circuit board. Any induced voltage change on the plate is fed to the input of the peak detector section of the op-amp circuit. The Schmitt trigger monitors the voltage across the capacitor...
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This is a three input mixer.so you can use this to play your instruments or you can use this for small theaters.so try this.I have use this one for our special meetings.Total gain of the system is around 45decibel. Note # All inputs ...
Mixer circuit LM348 IC 3 Chanel. The series features three channel microphone mixer and made ??with LM348 IC. The series of mixer channel 3 is to mix audio signals from the microphone on standard microphone amplifier.
Three Channel Audio Mixer Circuit. Although the modular Portable Mixer design available on these web pages has become a hit for many amateurs, some correspondents required a much simpler device, mainly for mixing ...
As with any audio mixer circuit, a slight loss is always introduced. The final summing ... The mic inputs are amplified about 100 times or 40dB, the total gain of the mixer including the summing amplifier is 46dB. The mic input is ...
At the output line installed capacitors C3 and C4 as a couple and compensator for output in accordance with the amplifier or mixer (100mV rms). receiver microphone circuit. Part Series FM Wireless Microphone Receiver Hi Fi ...
If you happen to have a suitable one in your junk box, give it a try with this circuit - I doubt that you will be disappointed with the result. I have used this circuit in Front-of-House, fold back (monitor) and studio mixers, and ...
Trance & Dance Mix 2012
Basic Home Recording Mic & Mixer Set-Up...
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