Electronics Help Care electronics circuit diagram
audio equalizer and amplifier:
This is an audio equalizer and amplifier circuit diagram. It’s one of the best circuit diagrams for the audio amplifier. This circuit has 4 adjustable vol. 1st one is for the volume. 2nd one is for the bass. 3rd one is for the mid-range. And the fourth one is for the trouble. This circuit runs with 12 volts only. It’s a stereo bass tone circuit. stereo audio graphic. dual channel, left channel, and right channel.
Three-Band (Bass, Mid, Treble) Tone Control Circuit:
This note provides an overview of an Active Tone Control Circuit (often based on the Baxandall design) used in audio preamplifiers to allow a user to adjust the signal’s frequency response across three distinct bands: Bass, Mid-range, and Treble. A circuit like this typically utilizes an Operational Amplifier (Op-Amp), such as the 4558D or NE5532, to provide gain and create an active filter network within its negative feedback loop.
The core of the tone control is a network of Resistors (R) and Capacitors (C) whose impedance changes with frequency. Variable resistors (Potentiometers – VR) are used to adjust the amount of signal that passes through these frequency-dependent paths, thereby boosting or cutting the corresponding band.
Bass (Low Frequencies): Boosts or cuts frequencies typically below 200Hz. The control potentiometer (VR) is connected in series with a large-value capacitor (e.g., 100 nF to 220 nF), which effectively blocks higher frequencies from being adjusted.
Mid-Range (Mids): Boosts or cuts frequencies typically between 500Hz and 2.5kHz. This band requires a Band-Pass filtering network, where the potentiometer is linked between a high-pass and a low-pass section to isolate the middle frequencies.
Treble (High Frequencies): Boosts or cuts frequencies typically above 2 kHz to 20kHz. The control potentiometer is connected in series with a small-value capacitor (e.g.1nF to 10 nF, which allows high frequencies to pass easily but blocks lower ones.
Transistor amplifier circuit diagram:
This is the Transistor amplifier circuit diagram using MJl21193 and MJl21194. This is a mono circuit diagram. We can use a maximum 70-0-70 voltage. We can get 400 output watts using this circuit board.
Transistor amplifier circuit diagram using mjl21103 and mjl21194
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