MICROFORUM

it seems, the datasheet's creator was under educated if was unable to translate binary to hex or hex to binary numbers. Difficult to say what's correct.

I think, you need a licence for ispLever Classic.

I have never seen an application or circuit where multiple MCP23009 was used. If you use one MCP23009, set address input to zero. My opinion, analog address setting for multiple MCP23009 can result in problems and instability.

We are very sorry, but there is no solution for ZX Spectrum. ZX Spectrum, as I know, has an RF output for the TV.

if you replace half of HP-85 with newly developed electronics, then Yes.

The solution is easy. You need to convert 7-segment-code either to BCD or to decade-code. If you convert the 7-segment code to decade code, you drive nixie directly. If you convert 7-segment code to BCD code, you need change voltage level from 12V to TTL with a resistor divider and use 74141 nixie d...

First, you need to specify what you need - functions, frequency range ... In the past were produced several IC's for functions generators. I think the best was Maxim 038. This IC generates sine, square and triangle. Max. frequency was theoretically 20 MHz, really 16 MHz. Unfortunately, Maxim 038 is ...

mostly the TC circuit like AD595 or AD597 do it. Check the circuits for thermocouples connection and read the datasheets.

try LT1004LP. Note, the resistors needs to have different value compare to ICL8069.

That's easy. Use a standard AD converter you like. Maybe 7107 or 7135 or a MCU with ADC. At input you need to make a Precision full-wave AC/DC converter (two OpAmps). At input to precision full-wave AC/DC converter you need a resistor divider.