The time relay is based on the NE555 timer (U1) configured as a monostable multivibrator. Using button B2, the relay is reset and remains in standby mode. A single press of button B1 activates the relay for a preset time period.
The on-time duration is determined by capacitor C4 and trimmer Tr1 and can be adjusted within a range from 0 to 160 seconds. An LED indicates whether the relay is activated.
The circuit includes a start button and a premature stop button, allowing manual interruption of the timing cycle.

Technical Specifications:
Type: time relay.
Integrated circuit: NE555.
Operating mode: monostable multivibrator.
Time range: 0 - 160 s.
Time adjustment: trimmer Tr1.
Indicator: LED.
Buttons:
- start,
- stop.
Supply voltage: 10 - 16 V DC.
Maximum current: up to 100 mA.
PCB dimensions: 50 x 45 mm.

This product is a DIY assembly kit.
It is also available as a fully assembled module - Product code 1580 (separate product).