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Apple PlainTalk Microphone Adapter

Apple PlainTalk Microphone Adapter by JM Talbert2 / November 12, 2009 4:00 AM PST The PlainTalk Microphone has an elongated mini TRS plug and an enclosed Mono Mic Preamp.

Tip (White) is the power supply for the enclosed preamp. 5v to 9v seems to work.
Ring (Black) is the line-level output from the preamp.
Sleeve (Shield) is Ground

Use a 9 volt battery, a Stereo 1/4" Jack for the line out, and an enclosure. Cut off and toss the elongated mini TRS.

Make the following Connections:

1. Black from the PlainTalk to 1/4" Tip.
2. White from the PlainTalk to + side of 9volt battery
3. Shield Ground Wire from the PlainTalk to 1/4" Sleeve.
4. Negative side of 9 volt battery to 1/4" Ring. When a Mono Phone plug is inserted into the 1/4" Jack the Ring will connect to the Sleeve completing the circuit with the battery.

Mercedes Benz Diesel CDI EGR Emulator Circuit Diagrams

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Mercedes EGR Emulator Circuits for Electric Wahler EGR on Diesel EngineFor any car fitted with a MAF you can't just block the EGR valve as the MAF detects the reduced airflow when the valve operates. If it fails to report this reduction the ECU throws a code, turns on the MIL light and engages Limp Home mode.
The EGR valve is operated in varying degrees whenever the engine is in cruise mode.

A circuit has to be designed that reduces the MAF output voltage whenever the EGR valve is called to actuate.

Having seen a mod on another forum I decided to give it a go and installed it last night.

The circuit is really simple. The EGR valve transducer is fed with constant 12v which is proportionately shunted to Gnd to create the potential to activate the transducer, to engage the EGR solenoid and allow hot gasses into the intage via the EGR valve in varying degrees.

The MAF is in the cold air intake. the EGR gasses enter further downstream. the MAF then monitors the reduced cold intake when the …