Transistor Logic Level Converter Circuit

If you take a peek at the board s schematic you d find that the bi directional logic level converter let s shorten that to bd llc is actually a very simple device there is basically one level shifting circuit on the board which is repeated four times to create four level shifting channels.

Transistor logic level converter circuit.

Transistor transistor logic ttl is a logic family built from bipolar junction transistors its name signifies that transistors perform both the logic function the first transistor and the amplifying function the second transistor as opposed to resistor transistor logic rtl or diode transistor logic dtl. Ttl is an acronym for transistor transistor logic. I have connected the circuit to gpio no 17 and set it high. Transistors are basically fancy speak for electrically controlled switches.

I am trying to make a logic level converter using transistor bc547. Simple bi directional logic level converter. For any logic family there are a number of threshold voltage levels to know. The circuit uses an n channel mosfet to convert the low voltage logic level to a high voltage logic level.

Ttl integrated circuits ics were widely used in applications such as. If you are using transistors to interface to the outside world you may find fets simpler easier and better. A simple logic level converter can also be built using resistive voltage dividers but it will introduce voltage loss. Auto direction sensing translators for both push pull buffered and open drain applications.

I have done this to convert 3 3v to 5v for pwm application. Below is an example for standard 5v ttl. 1 why is there no ground in the. This is to convert voltage level of rpi gpio from 3 3 to 5v.

A logic level mosfet may be easier. Many voltage translator circuits require that you know the supply voltage and therefore the drive voltage of the input. The transistor can handle higher voltages than most logic level translator circuits. View a comprehensive level shifter voltage level translator portfolio including direction controlled level translators.

A rather more obvious circuit uses a mosfet or bipolar transistor as a switch driving the gate or base with the 3 3v logic and taking the 5v logic output from the drain or collector. Voltage level translation or logic level shifters will solve the incompatibility between different devices supplied by different power domains. And hybrid application specific. Logic level mosfet or transistor for interfacing.

It relies on circuits built from bipolar transistors to achieve switching and maintain logic states. A transistor could translate between a 3 3 v circuit and a 12 v circuit for example. There are many options on the internet some using a logic ic and some using 2 npn transistors converter and inverter but i never found an option using only a single transistor and 2 resistors. I have wired the circuit according to this diagram.