/diy/ - Do It Yourself

>>1606618
>I've never held a soldering iron before

>>1543488
Q: What's a worse mistake than dropping your soldering iron?
A: Catching it.

>>1537372
>Soldering isn't that hard

I have nothing to contribute. My wife does all the soldering.

>>1147697
>How do you get lead poisoning from soldering?

>>858841

Try a few electronics projects. Learn to solder.

Previous thread:
>>836221

>I'm new to electronics, where do I get started?
There are several good books and YouTube channels that are commonly recommended for beginners and those wanting to learn more, many with advanced techniques. The best way to get involved in electronics is just to make stuff. Don't be afraid to get your hands dirty.

>Links to get started
http://pastebin.com/9UgLjyND

I need a 555 to be able to maintain it's duty cycle while changing the frequency with a pot resistor.

How do I do this? Bonus points if someone tells me how to easily adjust the duty cycle on the go too.

Ideally I want an ultrasonic frequency between 20 and 30 kHz and the duty cycle should be anything between 50 and 70%.