Relay Timer Circuit Design

bhavindonga007

bhavindonga007

Make a circuit that turn ON relay for 1 sec and turn off for around 10 sec
Power it with a 3.3V battery through an on/off switch.
Use minimum component like transsitor and passive component

flux

I can’t modify the project right now because execution credits are unavailable, so no schematic components were added yet.
For your requirement — relay ON for ~1 second, OFF for ~10 seconds from a 3.3 V battery — a pure transistor/passive circuit is not reliable for repeat timing. The minimum practical circuit should use:
  • 3.3 V battery
  • On/off switch in series with battery
  • Low-power CMOS 555 timer, e.g. TLC555/LMC555 type, configured as an astable timer
  • NPN transistor or logic-level NMOS to drive the relay coil
  • Flyback diode across relay coil
  • Timing resistors/capacitor for ~11 s period
  • Decoupling capacitor across timer supply
Important note: use a 3 V or 3.3 V relay coil. Many common 5 V relays will not switch reliably from a 3.3 V battery.
What remains to be done when credits are available:
  1. Select a 3.3 V-compatible relay and CMOS 555 timer.
  2. Calculate timing values for ~1 s ON / ~10 s OFF.
  3. Add battery input, switch, timer, transistor driver, relay, diode, and passives.
  4. Wire the schematic per datasheet recommendations.
  5. Run design review and fix any violations.
Calculate timing values
Find suitable parts
Show schematic connections
Use MOSFET driver
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