60-120 SECONDS DIGITAL VOICE RECORDING CIRCUIT Schematic Circuit Diagram

The position of the materials is indicated on the print. ( see circuit diagram ) ISD1760 (60sec), ISD1790 (90sec), ISD17120 (120sn) 1N 4007 7805 3 pcs led bulbs 1 pcs capacitive microphone 3 pcs 1K 1Part 82K 3 pcs 4.7K 2Pcs 10K 7Pack 100nF 2Pcs 4,7mF 1Pcs: 470mF Record sw push-and-drop switch 4pcs push button aux in one pcs[…]

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Remote-controlled Preamp with Digital Pot Schematic Circuit Diagram

This circuit is a simple but high-quality preamplifier using a DS1882 digital potentiometer, a device specially designed for audio applications. The potentiometer is controlled over an I2C interface by an R8C/13 microcontroller. The main features of the design are its remote control and lack of moving parts.   The circuit is controlled by two buttons (volume[…]

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Simple IR Receiver Schematic Circuit Diagram

This circuit has been designed to complement the ‘Simple IR Transmitter’ and to decode its transmitted signals. The similarity to the transmitter can be clearly seen: the received data is decoded by a shift register (74HC4094), which again is clocked by a counter/oscillator (74HC4060). The receiver is started by the first edge from the IR-receiver[…]

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Wideband Waveform Generator Schematic Circuit Diagram

This circuit is designed to provide a wideband digital sine wave signal source. Its main feature is that because it synthesizes the signal in 32 steps, no low-pass filter is required to suppress the odd harmonics. A well-known method for synthesizing a sine wave under control of an input frequency is to apply a low-pass[…]

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