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Posts tagged TDA7294 IC

Free Download TDA7294 IC Second Voice recorder module and Service Manual free download, schematics, datasheets, eeprom bins, pcb

Free Download PDF TDA7294 IC Second Voice recorder module and Service Manual free download, schematics, datasheets, eeprom bins, pcb TDA7294 IC Second Voice Recorder Module. Non-volatile multi message recorder using ISD chips. Just change one resistor for longer duration. Standalone operation using just six onboard bottons. Record via built-in microphone or external line in. Speaker […]

circuit 12V to 6V

voltage regulator circuit 12V to 6V using LM371, 1N4004

Circuit diagram keytop and display for electronic devices

Circuit diagram keytop and display A keyboard “key figure” who work with electrical contact between the surface of the keyboard and the underlying circuit when pressed keytop area, used by some home computers the early 1980s, and has been widely used in consumer electronic devices.

Amplifiers Audio using LA4558

Amplifiers Audio using LA4558 circuit board

Audio test oscillator circuit

Audio test oscillator circuit using CD4584, 74c14

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