Modify time delay relay module so the timer starts automatically, INSTANT ON, delay off auto-start

You can easily modify a relay timer control module to auto-start or self- initialize at Power On.  This Instant On feature can be very useful in many applications where you want the timing sequence to start immediately when power is applied.  No additional pushbutton switch or operator action is required to start the timer.  These off the shelf time delay relays are very economical and reliable.  The specific module used in this video operates over a very wide DC voltage range - 5 to 30 VDC.  This modification creates an INSTANT ON, TIME DELAYED OFF device.  I have tested this circuit modification with both a 5V USB power supply as well as 12VDC battery connected to the V+ and V- and the timer works AUTOMATICALLY as expected.

See comment below from quick _dry who says "even simpler, this will work with just a 2.2uF cap from V- to Trig" .

Here's another video showing you the schematic for a very simple INSTANT on time delay control using a 555 integrated circuit and only 2 to 4 additional components.   555 Timer Circuit, INSTANT ON, delaye...

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• #howto_style
• #555_timer
• #auto_start_timer
• #self_initialization_timer
• #delay_timer_relay_modification
• #instant_on_time_delay_relay
• #instant_on_relay_module
• #self_start_timer
• #instant_on
• #delay_off
• #instant_on_delay_off
• #instant_on_at_power_on
• #timer_starts_at_power_on