jonthornham
New Member
I recently started learning about electronic circuits. I am working through the book "Make Electronics" by Charles Platt. I am changing things as I go to try and understand what happens when I make changes. However I am lost with what happens when I try the following. My circuit is in the picture attached.
**broken link removed**
The components are:
R1: 470,000Ω
R2: 220Ω
R3: 220Ω
R4: Variable (here's where I get confused)
C1: 22µF
Q1: 2N6027 PUT
Diode
So basically the the capacitor charges until the voltage on the anode of the PUT is greater than the gate value. At this time current is discharged from the capacitor into the anode out of the cathode and the LED lights up.
My confusion comes when I change the value of R4. My thought is that if I were to increase the value of R4 the LED would flash less frequently and for a longer period of time. However when I increase R4 in flashes more frequently and I have no idea why.
Can someone please help?
Take care,
Jon
**broken link removed**
The components are:
R1: 470,000Ω
R2: 220Ω
R3: 220Ω
R4: Variable (here's where I get confused)
C1: 22µF
Q1: 2N6027 PUT
Diode
So basically the the capacitor charges until the voltage on the anode of the PUT is greater than the gate value. At this time current is discharged from the capacitor into the anode out of the cathode and the LED lights up.
My confusion comes when I change the value of R4. My thought is that if I were to increase the value of R4 the LED would flash less frequently and for a longer period of time. However when I increase R4 in flashes more frequently and I have no idea why.
Can someone please help?
Take care,
Jon
Last edited: