Mt8870 Proteus Lib 35 May 2026

When a valid DTMF tone pair enters IN+, the StD pin goes HIGH. The binary output on Q4:Q1 should be:

Typical minimal wiring:

Is the MT8870 in Proteus? By default, standard versions of Proteus (like 8.6, 8.8, or 8.13) do not always include the MT8870 in the built-in library search under that exact name.

How to find it:

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.

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. mt8870 proteus lib 35

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.

If you are simulating this, you cannot easily simulate a real phone call audio signal. You need a DTMF Generator.

Components needed:

Connection Diagram:

The MT8870 is designed to decode DTMF signals into their corresponding 4-bit binary codes. DTMF signaling is a method of encoding a dialed number or other information over an analog phone line. When a key is pressed on a telephone keypad, it generates a unique combination of two tones, one from a low-frequency group and one from a high-frequency group. The MT8870 detects these tones and decodes them into digital outputs.

The MT8870, known for its reliability and efficiency, is a crucial component in various electronic and telecommunication systems. As a DTMF decoder, it plays a vital role in interpreting the tones generated by a telephone keypad, enabling a wide range of applications from simple remote controls to sophisticated telecommunication systems. When a valid DTMF tone pair enters IN+,