Mt8870 Proteus Lib 35 Here

Topic: MT8870 Proteus Library & Simulation Guide

Part 6: Alternatives if "Lib 35" is corrupted

Given that "lib 35" is a ghost from older forums (likely 2015 era), it may be incompatible with modern Windows 10/11 and Proteus 8.9 SP5+.

Option A: Use Arduino Library within Proteus Instead of hunting for a broken MT8870 model, design the circuit with an Arduino. Use the ArduinoISP or VIRTUAL TERMINAL to simulate decoding. mt8870 proteus lib 35

Option B: Build the Logic Gates For academic projects, you can simulate the 8870's truth table using a Lookup Table (LUT) or a 4-to-16 decoder. This proves your concept without the specific library. Topic: MT8870 Proteus Library & Simulation Guide Part

Option C: The Working Library Source As of 2025, the most stable MT8870 library is found within the "Proteus 8.9 Complete Library Collection" by Electronics Hub or The Engineering Projects. Search for: "MT8870 Library for Proteus The Engineering Projects" . Their version explicitly supports Proteus 8.9 SP3 and up. Place a SIGNAL GENERATOR (VSINE) on the schematic

Introduction

If you are an electronics engineering student or a hobbyist working on Dual-Tone Multi-Frequency (DTMF) projects, you have likely searched for the term "MT8870 Proteus lib 35" . You may need the MT8870 DTMF decoder for a project involving remote control via telephone lines or a wireless robot controlled by a mobile phone.

However, many users hit a wall: Proteus does not include the MT8870 in its default library. Furthermore, the phrase "lib 35" leads to confusion. Is it version 3.5? Is it a specific library ID?

This article will clear up the confusion, provide you with the correct files, and guide you step-by-step through adding the MT8870 to Proteus 8 and Proteus 8.9 (commonly associated with library versioning).

Simulating a DTMF Tone:

1. Place a SIGNAL GENERATOR (VSINE) on the schematic.
2. Configure it for Frequency 1: 697 Hz (This is the '1' key row).
3. Configure it for Frequency 2: 1209 Hz (This is the '1' key column).
   • Note: Proteus standard generator only outputs one frequency. To simulate real DTMF, you need an external WAV file or a custom source. For testing, just connect a single frequency to see the logic change, but true DTMF requires both frequencies simultaneously.

C. The Object: "Lib 35" (The Ghost Library)

• The Problem: The MT8870 was not in the default "ANALOG" or "MICRO" libraries. Users had to find it in third-party repositories like Proteus Lib 35—a community-driven ZIP file containing obscure parts.
• The Myth: Search archives from 2009-2012 show that "lib35" often referred to a cracked or bootleg library pack. Asking for "lib 35" was a quiet way of saying, "I need the version that works with my specific crack, because the official update server is blocked."