Broadcast Audio from your DX-60
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Stereo amplifier circuit with LM1877
The LM1877 is a stereo amplifier designed to deliver 2W per channel into 8-ohm loads. It is intended to operate with a minimal number of external components, making it a versatile integrated circuit suitable for various audio amplification applications, such...
Audio booster
The amplifier's gain is nominally 20 dB. Its frequency response is determined primarily by the values of a few components, mainly C1 and R1. The schematic diagram values provide a response of ±3.0 dB from approximately 120 Hz to over...
Audio-amplifier
C9 is necessary to filter out RF input interferences. R3 in combination with C5 is used to limit the AF frequency bandwidth. The 470-f.IF power supply decoupling capacitor is C10.
C9 serves a critical role in the circuit by acting as...
KGA8010 Ultra Broadband Distributed Amplifier
The KIA6924S is designed to mute the popping sound produced when turning ON or OFF receivers, pre-amplifiers, main amplifiers, and other electronic audio equipment, as well as to eliminate noise generated during switch transitions. Manufactured by Korea Electronics (KEC).
The...
Simple Audio Test Oscillator Circuit
An 88 mH surplus telephone toroidal coil is utilized in a 1 kHz oscillator. It can provide up to 8 V peak-to-peak into a high-impedance load. The total harmonic distortion (THD) is 0.9%.
The circuit employs an 88 mH toroidal coil,...
1.5 Volt Tracking Transmitter
A 1.5 Volt tracking transmitter utilizing simple circuits. The current draw for this tracker is 3.7 mA, allowing the 1.5V button cell to have a prolonged lifespan.
The 1.5 Volt tracking transmitter is designed to operate efficiently with a low current...
Fast Audio Peak Limiter
The circuit devised by Phil Allison still has some input voltage limitations, since it is based on a FET. Junction FET VCAs also create considerable distortion, with the worst of it appearing when the signal is attenuated by 6dB. The...
FFT audio amplifier design
For all the subsequent tests, a high-quality signal generator from BlackStar was utilized. The PicoScope trace displayed below illustrates a pure 1 kHz tone from the signal generator. It is important to note that while the screenshots below depict the...
Transmitter Servicing Course
With the equipment ready for operation, the main line switch (S-831), the emergency switch (S-12), and the main line contactor contacts (K-831B) are all closed. The keying relay main contacts (K-1C) ground the center tap of the MO filament secondary...