Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => The Newcomer's Forum => Topic started by: saturated on August 23, 2026, 02:30:47 AM

Title: Diode limiter circuit
Post by: saturated on August 23, 2026, 02:30:47 AM
Lots of excitement here tonight  :dbtu:

Wondering if I predicted this correctly

IMG_20260823_011745539 (1) (1).jpg

I wanted to make the circuit with the diode pointing each direction ⬇️⬆️

And you know me I'm gonna start out with DC first

I better get this right  xP

I'm gonna add DC to Vin and since the diode is reverse biased the Vout will show voltage

Here goes

And...it does  :tu:

IMG_20260823_012827334 (1).jpg

Title: Re: Diode limiter circuit
Post by: saturated on August 23, 2026, 02:46:14 AM
Okay now it's time to try to input a sin wave and see what happens

IMG_20260823_011745539 (1).jpg

So.....

During the positive iteration of the sin wave (well we already know what's gonna happen from above)

During the negative iteration the diode will be forward biased and conduct so I'm guessing no voltage (maybe Vf?) will be seen

Ok I just did this and sure enough

IMG_20260823_014333110 (1).jpg

I'm really liking these circuits because they are simple  :lmao:
Title: Re: Diode limiter circuit
Post by: saturated on August 23, 2026, 03:04:03 AM
Now it's time to flip the diode around

IMG_20260823_014945143 (1).jpg

Now I'm adding positive DC to the input and about all I can get on the output is about 0.72V at 15.5V input

Ok now for a sin wave input

During a positive iteration the diode should conduct and Vout should be near ground maybe showing Vf

During a negative iteration the diode should be cut off and Vin reflected on Vout

Well here goes

Hey alright I got lucky

IMG_20260823_020128542 (1).jpg

You have to excuse me enjoying this because once I start adding a capacitor stuffs gonna get real  xP