SPI Signal Amplifier

The FEL-CP21 is the inline amplifier for the pixel runs — the box that keeps the far end of a long install behaving like the near end. SPI signal in, amplified SPI out: the data re-drives at the amplifier, so the stretch beyond it runs as clean as the stretch before it. The output carries 8 channels on the single-wire ICs and 4 on the dual-wire ones, the load reaches 10 amps — 50 watts of 5V strip, 120 of 12V, 240 of 24V — and the DC5-24V supply matches whatever the run uses. The body is the familiar inline 135×30×30.2mm strip at 66g, hiding in the run beside the CP1 and the CP4. The specifications do not list a pixel-count figure — the amplifier’s job is the signal, and the pixel capacity follows the controller and the strip it serves.

The amplifier’s job

A pixel signal degrades over a long run: the data the controller sends at the start arrives tired at the far end, and the pixels at the tail flicker or misread. The amplifier breaks the run in two and re-drives the signal at the break — the drive and the range the Highlights promise. One amplifier resets the stretch; a large install chains them along the run at sensible intervals, and the whole length decodes as one continuous show. The alternative — hoping the far end holds — is the flicker the crews get called back for, and the amplifier is the fix planned in from the start.

Eight channels, or four

The output follows the IC’s wiring, per the specifications: 8-channel amplifier output on the single-wire ICs, and 4-channel on the dual-wire ones. The single-wire ICs carry their data on one conductor; the dual-wire ICs add the clock line. Set the run’s IC type and the amplifier’s channels follow — the amplification matches the strips it sits between.

10 amps and the power band

The load reaches 10 amps through the amplifier — 50 watts of 5V strip, 120 of 12V, 240 of 24V — and the supply ranges DC5-24V to match the run. That is the same power band the CP1 and the CP4 carry, so the amplifier holds its section of the install without the PSU coming up short. Size each amplifier’s section to the strip it drives, and leave the headroom at the top of the band rather than loading to the ceiling.

Working envelope

Working temperature spans -20°C to +55°C, which covers the coves, the cabinets and the risers the runs pass through. The body is 135×30×30.2mm at 66g — the same inline strip-style unit the CP1 and the CP4 use, a fraction taller, hiding in the run with the wiring it amplifies.

Où est-il utilisé ?

The amplifier earns its place wherever the run outgrows the controller’s drive: the long façade lines that stretch past the first few metres, the multi-storey coves, the perimeter runs around the club floor, the signage that snakes across the frontage. Insert it at the point where the pixels start to misbehave, and the far half comes back to life — or plan it in from the start on the installs that are large-scale by design, one amplifier per stretch, wired and hidden at the build stage rather than retrofitted after the first complaint.

Where it sits in the range

The CP21 is the companion to the pixel controllers rather than a controller itself: the CP1 and the CP4 run the single strips, the CP2 decodes the DMX into pixels, the CD1 and the CA2 sit at the desktop and the Ethernet scale — and the CP21 extends whatever they drive. Put it in the run wherever the signal needs the refresh, and the controllers keep doing their job at the head of the line.

Why do buyers pick the FEL-CP21 over the alternatives? Here is what we hear from customers:
The run stays stable. The amplifier re-drives the SPI signal at the break — the far end behaves like the near end.
Eight channels, or four. The amplification follows the IC wiring — single-wire ICs get eight, the dual-wire ones get four.
Ten amps through the box. 240 watts of 24V strip, 120 of 12V or 50 of 5V — the same power band the CP1 and the CP4 carry.
DC5-24V. The supply matches whatever the run uses, 5V pixels through the 24V ones.
The inline body. 135×30×30.2mm at 66g — hidden in the run, next to the controller it serves.
Built for the large scale. The Highlights say it and the chain says it — the big installs run amplifiers along the length, spaced where the data needs the refresh.
The stability story. Ensures stability and safety, per the Highlights — the misreads and the flicker at the tail end are what the amplifier exists to prevent.

The FEL-CP21 keeps the long pixel runs honest — the inline amplifier for the installs that outgrow the controller’s drive.
Façade lines and outlines. The perimeter runs that stretch past the first metres, amplifiers spaced along the length and hidden behind the fixings.
Multi-storey coves. The riser-to-riser runs decoded at the top and refreshed on the way down, floor by floor.
Club floors. Perimeter pixel runs around the floor and the bar, the amplifiers keeping the far corner in step with the DJ’s first beat.
Large signage. Frontage lettering that snakes across the wall and down the returns, each stretch reset at the break by the 66g inline unit.
Fitout chains. The long-hall and the aisle runs, amplifiers planned in from the start on the builds that are large by design, one per stretch.
The CP21 extends whatever the pixel controllers drive — the CP1 and the CP4 at the inline scale, the CP2 and the CD1 on the DMX side, the CA2 at the Ethernet scale — and the run stays one show from end to end, whatever the length.