MicroHAM MK2R Manual de usuario descargar pdf (Pagina 3)

Circuit Description

The schematic of the Band Decoder is shown in Figure 1.

Figure 1.

The decoder accepts a four bit binary-coded decimal (BCD) word at TTL levels and decodes it

at IC3 (a CMOS BCD-Decimal Decoder). Data Bit A is the Least Significant Bit (LSB) and Data

Bit D is the Most Significant Bit (MSB). All nine bands are decoded as described in Table 1.

The outputs of IC3 go high to reflect that band in use.

Four of the IC3 outputs are routed to IC1, five of the IC3 outputs are routed to IC2. IC1 and

IC2 contain eight N-channel Darlington pair transistor switches, see Figure 2.

Figure 2.

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MicroHAM MK2R Manual de usuario Pagina 3