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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I2C tip

The 8-bit I/O chip “Type PCF8574 is very popular: it is used, among others, on the AD-DA 1/0 module, the opto relay card, and the LC display – all published within the past 12 months (see References). Since it is often desirable to connect a number of 8574 modules to the 12C bus, it is[…]

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Angled bus extension for PCs

Angled bus extension for PCs: This 8-bit bus extension card for IBM PCs and compatibles allows you to connect and test insertion cards without having to open the computer. The printed-circuit board shown here is angled and has a 62-way slot connector to accept external boards. The pins of the bus connector are soldered straight[…]

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PC fan control Circuit

PC fan control Circuit

It is an unfortunate and well-known fact that most PCs of IBM and compatible type make a lot of noise. which is both undesirable lots of noise in the both undesirable (as regards noise in the working environment) and unnecessary (as regards the actual power consumptions. which is often quite low ), many fans in[…]

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