Digital switch

[Tetris911]

Hello everybody, I'm new to this forum and am looking forward to learning more about electronics and getting help with projects.
Speaking of help I'm building a simple ESP32oscilloscope designed by Jobit Joseph on the Circuit Digest website.
I'm looking to replace the regular switches (SW1 and SW2) in the analog front end  with some kind of digital switch that would let me cycle though the settings
with button pushes. Thanks in advance foe any help!

[james_s]

A relay controlled by a transistor is the most obvious solution that comes to mind.

[ledtester]

Yes, using relays is generally what's used in oscilloscopes. See this StackExchange discussion:

https://electronics.stackexchange.com/questions/465202/relay-inside-oscilloscope-relay-vs-other-switches

[jbeng]

A relay controlled by a transistor is the most obvious solution that comes to mind.

I would think that's about the only way to do it without putting a limitation on the amplitude of the input signal.
Just about any solid-state switching would likely be limited by the power supply voltages of the switching devices.

[pcprogrammer]

Check out the schematics of the FNIRSI 1013D and the Hantek DSO2D10 given in these links:

https://github.com/pecostm32/FNIRSI-1013D-1014D-Hack/blob/main/Schematics/1013D/Scope_Analog_Input.png
https://github.com/pecostm32/Hantek_DSO2000/blob/main/Schematics/Mainboard/Analog_Input_1.png

Both use a mix of mechanical relays and solid state switches to control some of the settings. The solid state one is used for AC/DC select.

[Infraviolet]

Something like a 74HC4066 or similar IC? More compact than a relay and lower power requirements, but will only tolerate small currents on through the switching element. These sort of analog switch ICs also won't cope with higher voltages (some types 5 volts, others might handle 12), but as your oscilloscope's core is an ESP I assume you aren't  going to be measuring larger voltages with it?