BenchChapter 7: Frames and loops

B46GAIN

The task

V1 and V2 make a sine wave from 0.5 to 4.5 volts, but R1 and R2 halve it before P0.

Undo the divider: on CH2, put out the full wave as a PWM duty on P1.

The board

The chip's ports, each with its kind and the parts its signal reaches. Cyan reads, lemon writes. On a narrow screen, scroll the board sideways to see all of it.

Sources: V1 2 V sine at 25 Hz and V2 2.5 V
Resistors: R1 10 kΩ, R2 10 kΩ, and R3 1 kΩ
Capacitors: C1 1 µF
Probes: CH1 and CH2

Key idea

CH1 shows what P0 reads, half of the source.

Hints

Each hint goes a step further than the one before. Open them one at a time.

Hint 1Show

MUL 2 doubles A.

Hint 2Show

A reading of 45 percent at the top becomes a duty of 90 percent: 4.5 volts.

Solution

Reveal the Full SolutionThe complete program for GAIN. Open it only when you want the answer.

The reference program

The game's own solution. It passes every test and scores exactly par on every benchmark.

Double the halved input back to full size.

u1SC-2 standard

IN P0
MUL 2
OUT P1

CYCLES: 400; at par
ENERGY: 800; at par
NODES: 1; at par
INSTRUCTIONS: 3; at par