Ci V Usb Interface Schematic Top: Icom

Ground loops between a computer and a radio transceiver introduce significant RF noise, hum, and can potentially damage equipment during a lightning strike or power surge.

Before looking at the schematic top, it is crucial to understand what the interface does. icom ci v usb interface schematic top

A significant challenge when connecting a computer to a radio is the risk of RF (Radio Frequency) noise interfering with the data lines or even entering your PC. One way to combat this is to add an to the schematic. Ground loops between a computer and a radio

This is the minimalist's dream. The schematic often uses two general-purpose NPN transistors, such as or 2N3904 , along with a few resistors and diodes. It works by using one transistor to drive the bus when transmitting, and another to buffer the received data. This circuit is simple, low-cost, and effective for a single radio. However, it may not have the current sinking capability to drive a bus with multiple devices. One way to combat this is to add an to the schematic

The TXD and RXD pins of the FTDI chip are connected together through a diode (1N4148) with the cathode facing the TXD pin.

Prevents ground loops and RF feedback between the PC and the transceiver. The Top Schematic Design