Skip to main content

Wireless am microphone

Wireless am microphone
Transistor Ql and its associated components comprise a tuneable rf oscillator. The rf signal is fed to transistor Q2, the modulator. Operational amplifier ICl increases the audio signal and applies it through resistor R4 to the base of Q2. Tune an Wireless am microphone AM radio to an unused frequency between 800 to 1600 kHz. Tune Ll for a change in the audio level coming from the radio. Peak the output by adjusting L2 If Ll is disturbed, it may be necessary to readjust L2 for peak performance. Depending on the impedance of the microphone audio sensitivity can be increased by decreasing the value of RIO and vice versa. Wireless am microphone.

Wireless am microphone
Wireless am microphone


Labels:

Comments

Post a Comment

Popular posts from this blog

200W Hybrid Audio Amplifier Circuit

200W Hybrid Audio Amplifier Circuit - c onnecting two TDA2030 thru cheap power transistors we can create a amplifier wich can deliver a higher power. With the components value from the schematic the total amplifier gain is 32 dB. The speaker can be 2 ohm instead of 4 ohm if we use the TIP transistors. TDA 2030 is produced by SGS Ates and is a complete audio amplifier. AB class of the final amplifier cand deliver up to 14W on 4 ohm at a +-14V power supply. With a proper designed power supply this audio amplifier can output 200W. Active components: IC1, Ic2 TDA 2030 T1, T3 = BD 250, TIP 36 T2,T4 = BD 249, TIP 35 D1 … D4 = 1N4001 200W Hybrid Audio Amplifier Circuit
2 comments
Read more

2 x 15 W stereo Bridge Tied Load (BTL) audio amplifier

General description: The TDA8946J is a dual-channel audio power amplifier with an output power of 2 × 15 W at an 8 Ω load and a 18 V supply. The circuit contains two Bridge Tied Load (BTL) amplifiers with an all-NPN output stage and standby/mute logic. The TDA8946J comes in a 17-pin DIL-bent-SIL (DBS) power package. The TDA8946J is printed-circuit board (PCB) compatible with all other types in the TDA894x family. One PCB footprint accommodates both the mono and the stereo products. Features: Few external components Fixed gain Standby and mute mode No on/off switching plops Low standby current High supply voltage ripple rejection Outputs short-circuit protected to ground, supply and across the load Thermally protected Printed-circuit board compatible Circuit Diagram: Circuit Diagram for 2 x 15 W stereo Bridge Tied Load (BTL) audio amplifier PCB layout: PCB layout TDA8946 Datasheet for TDA8946J:   Download
Post a Comment
Read more

Multifunction quad power amplifier with built-in diagnostics features

Features: Multipower BCD technology DMOS power output High output power capability 4 x 25 W / 4  @  14.4 V, 1 kHz, 10 % THD, 4 x 35 W EIAJ Max. output power 4 x 60 W / 2  Full I2C bus driving: Standby Independent front/rear soft play/mute Selectable gain 26 dB - 12 dB (for low noise  line output function) I2C bus digital diagnostics Full fault protection DC offset detection Four independent short circuit protection Clipping detector ESD protection Description: The TDA7561 is a BCD technology quad bridge type of car radio amplifier in Flexiwatt25 package  specially intended for car radio applications.  Thanks to the DMOS output stage the TDA7561   has a very low distortion allowing a clear powerful   sound.  This device is equipped with a full diagnostics  array that communicates the status of each   speaker through the I2C bus.The possibility to  control the configuration and behaviour of the ...
Post a Comment
Read more