Tone generation and testing with an 8051 microprocessor

ToneGen1: Tone generation unit

Tone generation and testing unit

Based on 89C2051 - an 8051 derivative microprocessor
R2R D/A converter to generate tone
Uses analog switches to steer test tones and results
Programmed in assembler to produce pure 1khz tone
Simple straight forward test equipment built for customer project

The Tone generator was a simple project built as a test unit for a customer design job. We use two analog switches controlled by the microprocessor code - one switch controls the signal going to the op-amp that drives the output, the other switch actually steers the results from the tone detector (the item on the clients board that is being tested) to light the appropriate LEDs. This unit worked quite well, considering the low parts count.

Circuit Diagram for ToneGen1