This article is about a slow Ring Oscillator made with transistors.

A transistor slow ring oscillator can be made slower by doubling the number of transistors, thus increasing the resistance seen by the charging and discharging capacitors.

You can see the video of my circuit working:

Step 1: Design the Circuit

You can see that I added additional transistors to my ring oscillator:

Some people might argue that I do not need Rt resistors and can simply replace Rt resistors with Ct capacitors. However, then I will need bipolar capacitors that cost more money.

Step 2: Simulations

Transient voltage simulations:

Simulations show that the circuit needs a reasonable about of time to start oscillating.

Transient current simulations:

Step 3: Make the Circuit

I used expensive resistors to make the circuit look better. You can read the value of those resistors easily.

Step 4: Testing

Testing showed that the circuit is in fact very slow as desired: