Wiring Schematic Diagram

Many low pass filter circuits for subwoofer are given here and this can be simply another one. The circuit given here using the opamp TL062 from ST Micro electronics. TL062 is twin high input impedance J-FET opamp that has very low power consumption and high slew rate. The opamp has wonderful audio characteristics and is extremely appropriate for this circuit.

Out of the 2 opamps within TLC062, 1st one is wired because the mixer cum pre amplifier stage. The left and right channel are connected to the inverting input of IC1a for mixing. The gain of 1st stage will be adjusted using POT R3.The output of the first stage is connected to the input of second stage through the filter network comprising of parts R5,R6,R7,R8,C4 and C5. The second opamp (IC1b) is a buffer and also the filtered output is offered at the pin 7 of the TLC062.

This Simple Portable FM transmitter includes a limiter, a microphone amplifier and a PLL digital tuning. All the components are placed on one circuit board. The RF power is switchable between 1 W (HI) and 0,2 W (LO).

The schematic diagram is split into 3 parts: RF part (numbered from 1), PLL (numbered from 30) and audio part (numbered from 50). Connect a 6 V / 0,1 A bulb to the output and set the correct frequency on PLL. Set the RF power to HI. currently activate the transmitter. you must tune it on a receiver. perhaps you may stretch coils of the L1. Fix the L1 in position when the tuning voltage (on Q3) is in range 4-9 V. Then use C15, C16 and C17 to regulate the best power (the highest light of the bulb). Then you'll be able to connect antenna and audio signal. change R1 till the audio sounds as loud because the alternative stations.

The MAX2369 may be a dual-band, triple-mode complete transmitter for cellular phones. The device takes a differential I/Q baseband input and mixes it up to IF through a quadrature modulator and IF variable-gain amplifier (VGA). The signal is then routed to an external bandpass filter and upconverted to RF through an SSB mixer and RF VGA. The signal is additional amplified with an on-board PA driver.

The MAX2369 is meant for dual-band operation and supports TDMA for the PCS band additionally as TDMA and AMPS for the cellular band. the required mode of operation is chosen by loading knowledge on the SPI™/MICROWIRE™-compatible 3-wire serial bus. The MAX2369 then routes the signals to the acceptable ports looking on that band is chosen. The MAX2369 includes 2 RF LO input ports and 2 PA driver ports, eliminating the necessity for external switching circuitry.

The MAX2369 takes advantage of the serial bus to line modes like charge-pump current, high or low sideband injection, and IF/RF gain balancing. it's packaged in an exceedingly tiny (7mm x 7mm) 48-pin QFN package with exposed paddle.

The image below shows a Block diagram of the entire mixer that includes four Input Amplifier Modules followed by four in-out switchable Tone management Modules, one stereo Line input, four mono Main Faders, one stereo dual-ganged Main Fader, four Pan-Pots, a stereo Main Mixer Amplifier Module and two additional Tone management Modules switchable in and out for every channel, inserted before the main Left and Right outputs.

The basic arrangement of this circuit comes from the recent Quad magnetic pick-up cartridge module. The circuit was rearranged to address microphone input and a single-rail low voltage provide.

This low-noise, absolutely symmetrical, two-transistor head amplifier layout, allows the utilization of a traditional FET input Op-Amp as the second gain stage, even for terribly sensitive microphone inputs.

The voltage-gain of this amplifier is varied by suggests that of R9 from 10 to one hundred, i.e. 20 to 40dB.

This is a really easy 2-way intercom circuit primarily based on a LM390 audio amplifier circuit . the intercom circuit is a stand-alone electronic communications system intended for limited or private dialogue. For this circuit you'll use a 8 ohms speaker, one for each station and require a vi volts dc power offer. Gain management will be done by capacitively coupling a resistor (or FET) from pin vi to ground.

The LM390 Power Audio Amplifier is optimized for 6V, 7.5V, 9V operation into low impedance loads. The gain is internally set at twenty to stay the external part count low, however the addition of an external resistor and capacitor between pins 2 and vi wil increase the gain to any value up to 200. The inputs are ground referenced while the output is automatically biased to at least one 0.5 the provision voltage.