It IS possible.
Maybe the device I am building does not have the thousands of features of the complicated and expensive software programmed Microchips used in the most expensive modules, but the fun is guaranteed. Analog old school are my rules.
The components that I am using are classic and cheap, resistors, capacitors, diodes, transistors and microchips of the CMOS 4000 series that can operate from 3 volts, which allows me to use two batteries of 1.5 volts to power them. Potentiometers of all values, a lot of cable and a protoboard are the basis of the tests (and errors).
Experimenting is the key, it is difficult for something to explode with 3 volts. The Internet has a lot of information to guide.
If you have some skill, you will quickly learn to weld. Building the circuit with free software is not complicated, you must have patience.
I will share with you my advances, discoveries and mistakes.
Let's start with a photograph of a welding/soldering session: