4 sec OTD

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4 sec OTD

Circuit Description

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Supposedly a 4 sec time delay before NE555 output, which should open a 2N5822 transistor to activate a relay. Operation of NE555 rectified by connecting pin 4 to Vcc, thus giving it a reset pulse at startup. Seems to operate properly, even though the bulb connected to the relay doesn't light up as it should - the currents in the circuit implies everything is operating as planned. The NE555 setup is done according to guidelines from TI.

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kvenkat225

11 favorites

Creator

Eosander

3 Circuits

Date Created

7 years, 3 months ago

Last Modified

7 years, 3 months ago

Tags

  • timer
  • ne555
  • need help
  • on delay