Sansui Tuners
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Stereo balance meter
To utilize the indicator, set the amplifier to mono mode and modify the balance control until both LEDs are equally lit. The amplifier is now in optimal stereo mode balance.
The circuit described involves an amplifier with a built-in indicator system...
Simple long-distance wireless FM microphone circuit
The loop antenna L1 is utilized for emission and also functions as the oscillation coil. The high-frequency current flowing through the antenna is synchronized in resonance with the oscillation frequency, ensuring optimal emission performance. Practical applications indicate that the effective...
Spy Telephone Circuit
This FM spy telephone circuit is connected in series with the phone line. When there is a signal on the wires, this transmitter will radiate airwaves through the wires.
This FM spy telephone circuit operates by integrating with the existing phone...
Stereo tone control circuit using IC TDA1524A
The stereo tone control circuit utilizes the integrated circuit TDA1524A. This IC serves as the central component in the design.
The TDA1524A is a versatile integrated circuit designed for audio applications, particularly in tone control systems. It features a dual-channel operation,...
Stereo channel controller
The add-on circuit presented here is useful for stereo systems. This circuit has provision for connecting stereo outputs from four different sources/channels as inputs and only one of them is selected/connected to the output at any one time. When power...
audio stereo channel selector circuit
This circuit is designed to connect stereo outputs from four different sources or channels as inputs, allowing only one of them to be selected and connected to the output at any given time. When the power supply is turned on,...
stereo balance indicator
This stereo balance indicator circuit diagram is designed using a few common external components. The schematic circuit is very simple to build and will provide a visual indication with LEDs for left, right, and center balance. Outputs from each channel...
FM Listening Bug
The one thing every spy needs is a small and well-concealed listening device. The FM Listening Bug Kit provides all the necessary components to construct a compact, single-channel listening device.
The FM Listening Bug Kit is designed for the creation of...
BA3822 five-point stereo graphic equalizer circuit design
The BA3822 is a five-point stereo graphic equalizer integrated circuit that operates with two channels. Each channel can independently set five center frequencies using external capacitors. This integrated circuit supports a wide operating power supply voltage range (VCC = 3.5V...