11. Specifications

Electrical

Power Supply: External regulated DC adapter, included. Region-specific plug type (US, UK, EU, or AU) based on shipping destination.

DC Input to Unit: 5v

Switched Outlet Load Rating: See https://dlidirect.com/products/iot-power-relay for details.

Outlet Configuration: Four AC outlets total. Two normally-off (switched on by relay), one normally-on (switched off by relay), and one always-on (unswitched). Outlet type matches destination region.

Timing

Base Time Range: 0.1 to 99.9 seconds

Base Time Resolution: 0.1 seconds

Timing Accuracy: ±0.05 seconds

Test Interval Settings: 1/8, 1/4, 1/3, 1/2 stop

Print Stop Select Range: -3 to +3 stops, in whole-stop increments

Memory

Program Memory Banks: 3

Stored per Bank: Base Time, Test Interval, Print Stop Select

Retention: Persistent across power cycles

Connections

DC Power Input: 5.5 x 2.5mm Jack

Enlarger Relay Jack: 3.5mm TRS

Footswitch Jack: 3.5mm TRS

What's Not Included in Specifications

The ΔStop 100 is designed to be compatible with the majority of standard darkroom enlargers, but enlarger compatibility depends on the specific enlarger model rather than the ΔStop's specifications alone. See Section 3 for compatibility guidance and the project page at deltastoptimer.com for a current compatibility list.