Category «Audio»

555-IC Timed Beeper/Alarm

This is a simple circuit of beeper using 555 timer. This circuit can be employed to energize lights, horn, or other signaling device at any desired interval when the mercury switch is triggered. Since the current handling capability of mercury switch is not so high, an SCR is used to handle current drawn by the …

AGC (Compressor) Speech Processor

This is a speech processor circuit that can be used in communication radio circuit. This circuit consist of two sections, they are amplification and compression or dipping. The combination of these processing will improve the  SSB communication intelligibility and provide higher average level while avoiding clipping. The 100K pot is used to adjust the compression …

LM10 Single-Cell Microphone Amplifier

This is a Single-cell microphone amplifier circuit. This circuit produce a voltage gain of 60 dB at 500Ω load with bandwidth 5kHz. This circuit can provide a 60dB gain up to 10kHz if it is unloaded. This circuit has a 10 kΩ input impedance. This circuit cannot neither produce an output swing closer than 800mV …

Superlinear FM (Frequency Modulator)

Designing various electronic circuit system (synthesizer, modem, decoder, data converter, etc) of ten need a frequency modulator subsystem. An FM modulator is very easy to build with TC9400 since the it has very good linearity as V/F converter. Here is the system’s block diagram: While Vin determines the amount of modulation (FM deviation) around the …