amplifier circuit diagram
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Nicad Battery Charger circuit
This simple charger utilizes a single transistor as a constant current source. The voltage across the pair of 1N4148 diodes biases the base of the BD140 medium power transistor.
The circuit operates by employing the BD140 transistor to regulate the charging...
Multiple-feedback bandpass filter
The operational amplifier (op amp) is configured in inverting mode. Resistor R3 connects the output to the inverting input, establishing the gain and the current through the frequency-determining capacitor, C1. Capacitor C2 provides feedback from the output to the junction...
BC547 Single Transistor Radio
The circuit diagram of a simple radio that uses one transistor and a few other passive components. Component: Diode, Capacitor, Inductor, Resistor.
The circuit design for a simple radio receiver typically incorporates a single transistor as the active amplification element, along...
Audio Mixer with one transistor
This single transistor audio mixer is utilized in an amplifier circuit design featuring a base-driven transistor, where the emitter is current-controlled. The majority of the driving current flows through the collector.
This audio mixer circuit employs a single transistor to mix...
Simple DC to 20 MHz Driver
The output cable from my 20 MHz function/sweep generator dangled over the side of the workbench, the alligator clip hovering over the floor. Deeply engrossed in a project, I moved the power strip on the floor a little closer so...
op amp Could someone help me understand this simple circuit
The circuit operates in receive mode, with the Push-To-Talk (PTT) switch enabling transmit mode. The speaker functions as both a microphone and a speaker. Most systems observed utilize a rocking armature transducer for the speaker. There is no base station...
One transistor audio mixer
Three or more inputs with individual level controls feed into the base of Q1, which provides a voltage gain of 20.
The circuit design involves a transistor amplifier configuration where three or more input signals are managed through individual level control...
Transistor Circuits
This page presents several transistor circuits that are not commonly found on other pages due to the absence of a specific topic. These circuits, however, illustrate particular points but lack detailed descriptions. An example of an RF amplifier circuit using...
analog mv switch for digital meters
This circuit utilizes a 4052 as a DC Analog Multiplexer. The inputs to this multiplexer must originate from low-impedance output operational amplifiers (OpAmps). The resistors depicted are unnecessary once the signal conditioning OpAmps are connected. However, 100K resistors can be...