Micro Phone Amplifier circuit with BC549$2cBC547
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Balanced Microphone Preamp
The design consists of differential compound pairs of transistors with a common mode (floating) gain control connecting the emitters of the pair. The compound pairs of 2N4403 and BC549s are far more linear than any single transistor. The circuit is...
Simple Hybrid Audio Amplifier
The ongoing debate regarding the superiority of valves versus transistors is not the focus here. However, for those undecided, this simple amplifier serves as an excellent test. It employs a valve as a pre-amplifier and a MOSFET in the output...
Electronic Horn
Electronic horn circuit diagram. When the power line is switched on, a basic tone is produced by transistor T2 and transformer X1, which is frequency-modulated by a wandering voltage generator affected by a low-frequency square wave generator. This is a...
Common base transistor amplifier circuit of a unit
A common base transistor amplifier circuit is characterized by its basic structure, which includes key components such as a biasing resistor, capacitors for coupling, and an amplifying transistor. The circuit features four resistors that establish the quiescent point, with the...
Dynamic Microphone Preamp Mono by Transister C945 (with PCB)
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TRANSISTORIZED THYRATRON RING COUNTER
Each bistable circuit comprises two oppositely-symmetrical germanium transistors, two diodes, and four resistors. An additional transistor, Q, facilitates the transition of the conducting state to the next position when actuated by a transfer pulse. The absence of capacitors allows for...
Auto Loudness Control
Simple add-on module. A simple approach to this problem can be done inserting a circuit in the preamplifier stage, capable of varying automatically the frequency response of the entire audio chain in respect to the position of the control knob,...
Wilf Rigter`s SIMD1 V2
In the never-ending quest for simplicity, even one extra diode is a price I loathe to pay. To avoid using extra components, it struck me that the two diodes in SIMD1 V1 were connected like the two junctions in one...
voltage transistor loop to limit the current
The second transistor (T2) is activated by the current passing through the resistor (R1). When a DALI slave unit is connected, this current matches the current flowing through the power transistor (T1). The resistor's value is selected so that when...