Powering the TTL logic must prevent overvoltages, which can destroy the TTL chip very quickly, and any conventional fuse can't effectively protect the TTL chip. Therefore, only other semiconductor circuits can quickly cope with overvoltage and protect the safety of TTL devices.
In the circuit shown below, if the voltage at the output terminal rises above 5.2V, the Zener diode breaks down, triggering the thyristor (SCR) to turn on, causing a rapid short to force the fuse to blow. 
The regulator IC is a familiar fixed voltage type of the LM7805. The 7805 is a three-pin regulator that requires a minimum voltage input of 7.5V to maintain stability, a maximum input voltage of 35V and a maximum load current of 1A.
In the circuit, it is shown that the capacitors connected on each side of the integrated circuit are very important for suppressing oscillations and must not be omitted. In particular, the 330nF input capacitor must be connected across the shortest path at the IC's pin.
I chose a 106A thyristor because it can handle anode currents up to 4A at 100V, but has a very sensitive gate that only needs about 200uA. This SCR is only turned on for a short period of time and therefore does not require a heat sink.
The rating of the fuse depends on the circuit and power supply you are using. Assuming a maximum power supply output current of about 200 to 300 mA, it can be used for a 500 mA fuse.
The voltage across the thyristor switch is highly dependent on the value of the Zener diode. You can experiment with different values ​​of Zener diodes to protect other types of circuits. The 4000 series CMOS integrated circuits have a 15V (AE suffix) or 20V supply voltage range (BE suffix) and an overvoltage protection device can be used for these.
Antenk Insulation Displacement termination connectors are designed to quickly and effectively terminate Flat Cable in a wide variety of applications. The IDC termination style has migrated and been implemented into a wide range of connector styles because of its reliability and ease of use. Click on the appropriate sub section below depending on connector or application of choice.
An insulation-displacement contact (IDC), also known as insulation-piercing contact (IPC), is an electrical connector designed to be connected to the conductor(s) of an insulated cable by a connection process. The IDC forces a selectively sharpened blade or blades through the insulation, bypassing the need to strip the cable.
IDC Plug / Socket - Card Edge Slot Connector
Card Edge SLOT Connector is the portion of a printed circuit board (PCB) consisting of traces leading to the edge of the board that are intended to plug into a matching socket.
IDC Connectors
The IDC connector is also known as an insulation-displacement contact, or insulation-piercing contact. It is a connector designed to work with ribbon cables, and uses sharp contacts to clamp onto the wire, piercing the insulation and connecting with the wire in a secure and convenient way.
This simple connection principle is ideal for multi-stranded ribbon cables, as it allows the connector to make an assured connection across the multiple wires without having to strip the wires. This cold welding connection may ensure a gas tight connection between the wire and connector.
The Antenk range of IDC connectors includes plug and sockets in configurations to suit your purposes.
IDC Connectors Applications
IDC connections are often used low voltage applications, such as to connect computer drives internally or to connect computer peripheries. They are often cited as preferable due to their having much faster installation speeds than conventional wiring connectors.
IDC connectors also have an advantage in that several IDC connectors can be attached to the same length of ribbon cable, able to handle multiple connections economically, saving time in more complicated installations.
IDC Connectors Features and Benefits
• Fast cold welding connection
• Cost effective
• Versatile
• Quick termination to wire.
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