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Tube❄️Time

next up is the 74LS362. it is a clock generator. you connect a crystal or square wave source and it produces four non-overlapping phased clock outputs. there is a separate VDD rail that can handle 12V for level shifting the outputs. i think this part was used in the TI 99/4A.

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Tube❄️Time

this is the 74LS624, which is a VCO (voltage controlled oscillator). i have no idea what it is doing in the 74xx series since it is totally analog!

oscilloscope screen showing a ramp waveform (representing the input to the VCO) and an output square wave gradually increasing in the frequency (representing the VCO output)
Darryl Ramm

@tubetime Pretty sure the claim at least was just TTL output levels 🤷‍♂️

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