Direct-coupled transistor logic

Unfortunately, DCTL has much smaller signal levels, has more susceptibility to ground noise, and requires matched transistor characteristics.

[4] John T. Wallmark and Sanford M. Marcus described direct-coupled transistor logic using JFETs.

[6] RTL also focuses heavily on polarity, specifically being a bipolar transistor switch.

They are still very important and changed the history of audio and are the fundamental stepping stones to creating higher-quality inventions.

A DCLT is known for doing three functions: Each of these functions makes the output voltage supply low, so it does not have a negative impact on the other circuits in the machine.Each of these functions lowers the output voltage supply to prevent any negative impact on the other circuits in the machine.,[clarification needed][clarification needed] Inverters are also known as NOT gates which can be connected by collector resistors.

For the next DCTL to turn on, there must be enough VCE(SAT) (saturation voltage) going through the previous circuit.

[6] If you want only a certain amount of circuits open, then the VCE(SAT) needs to be smaller than the next transistor VBE(ON) (voltage input) between the base and emitter.

The downside of this is that one of the circuits tends to do all the work and take up all the voltage (VBE) resulting in it overheating and then possibly breaking down.

The reason that the phenomenon is such a great problem is due to circuits being incredibly sensitive to noise, since they operate at a fast speed and low voltage.

[6] They can also limit the voltage output that other transistors may create and therefore lead to there being less issues with machines.