BuddytheReow
Breadboard Baker
Here is a step by step tutorial how to build the Amentum Boost from pedalpcb.com on a breadboard.
Here is the link for the build doc https://docs.pedalpcb.com/project/Amentum.pdf
Here is the schematic found in the build doc. This is a simple, one transistor booster circuit. There are 4 resistors, 4 capacitors, 1 electrolytic capacitor, a potentiometer, and a BJT Transistor (2N5089)
My first step is to block out the circuit on my breadboard. Here we really only have 2 circuit blocks: the power and the booster.
Usually I make my power section the upper right hand corner of my breadboard, but wherever you'd like to place it is up to you. Vcc in the power section is connected to 2 capacitors: C100 and C4. Both of these also go to ground.
The transistor is a 2N5089. I have the flat side facing the left so the pinout is EBC. Here is the pinout.
Now to add some jumpers and R2/R3. The input power, both capacitors, and an output jumper will go in the same row to complete your power section. This out jumper will be placed at an arbitrary place further down.
R2 goes from the emitter to ground. The emitter is the top pin in my breadboard pic. R3 has one lead into the collector (bottom pin in the picture) and goes up toward the input section of the circuit.
Now to add the potentiometer.
Pin 3 goes to the collector of the transistor and before R3. So, from left to right in this row it will be pin 3 jumper wire, R3, then the collector.
Pin 2 is our "output" wire and we will place it below this circuit block to get ready for the real output.
Pin 1 goes to our power source. As I'm writing this I realized the red jumper wire going from the power section to the pin 1 jumper is unnecessary. You may plug my pin 1 jumper (blue in the pic) directly to the power row or follow along the pic itself. Either way will work.
Since we've gotten the output section ready to go let's finish that first before we head back and wire up the input section. My black jumper wire from pot lug 2 is attached to C3. The other lead of C3 we can point it down. In this row there are 2 more connections: a 100k resistor to ground and our output wire. I have chosen a yellow one.
Ok. The end of the circuit is done. Let's go back to the input section.
We need to add a jumper wire from the base pin (middle in my picture) to the "free" lead of R3.
Where R3 and the yellow jumper wire added we have to add the butt end of C2. The front end is place a row or 2 upwards. From the front end we have to add 3 connections: R1, C1, and our input cable. R1 and C1 both go to ground. The input cable is also plugged into this row as well (it is green in my picture).
And there you have it! The Amentum Boost from pedalPCB.com. A nice and simple circuit. When and if you decide to start down the road of circuit design this would be a great in/out booster section.
Feel free to leave questions or comments.
Thanks Everyone!
BuddyTheReow
Here is the link for the build doc https://docs.pedalpcb.com/project/Amentum.pdf
Here is the schematic found in the build doc. This is a simple, one transistor booster circuit. There are 4 resistors, 4 capacitors, 1 electrolytic capacitor, a potentiometer, and a BJT Transistor (2N5089)
My first step is to block out the circuit on my breadboard. Here we really only have 2 circuit blocks: the power and the booster.
Usually I make my power section the upper right hand corner of my breadboard, but wherever you'd like to place it is up to you. Vcc in the power section is connected to 2 capacitors: C100 and C4. Both of these also go to ground.
The transistor is a 2N5089. I have the flat side facing the left so the pinout is EBC. Here is the pinout.
Now to add some jumpers and R2/R3. The input power, both capacitors, and an output jumper will go in the same row to complete your power section. This out jumper will be placed at an arbitrary place further down.
R2 goes from the emitter to ground. The emitter is the top pin in my breadboard pic. R3 has one lead into the collector (bottom pin in the picture) and goes up toward the input section of the circuit.
Now to add the potentiometer.
Pin 3 goes to the collector of the transistor and before R3. So, from left to right in this row it will be pin 3 jumper wire, R3, then the collector.
Pin 2 is our "output" wire and we will place it below this circuit block to get ready for the real output.
Pin 1 goes to our power source. As I'm writing this I realized the red jumper wire going from the power section to the pin 1 jumper is unnecessary. You may plug my pin 1 jumper (blue in the pic) directly to the power row or follow along the pic itself. Either way will work.
Since we've gotten the output section ready to go let's finish that first before we head back and wire up the input section. My black jumper wire from pot lug 2 is attached to C3. The other lead of C3 we can point it down. In this row there are 2 more connections: a 100k resistor to ground and our output wire. I have chosen a yellow one.
Ok. The end of the circuit is done. Let's go back to the input section.
We need to add a jumper wire from the base pin (middle in my picture) to the "free" lead of R3.
Where R3 and the yellow jumper wire added we have to add the butt end of C2. The front end is place a row or 2 upwards. From the front end we have to add 3 connections: R1, C1, and our input cable. R1 and C1 both go to ground. The input cable is also plugged into this row as well (it is green in my picture).
And there you have it! The Amentum Boost from pedalPCB.com. A nice and simple circuit. When and if you decide to start down the road of circuit design this would be a great in/out booster section.
Feel free to leave questions or comments.
Thanks Everyone!
BuddyTheReow
Don't sub a lower gain transistor or the bias will be way off.
