Friday Morning Breadboard: FZ-1…

[Coda]

Every Friday morning I like to throw something simple on the breadboard. Today is the Maesteo FZ-1. It needs some tweaking, however. Right now it is very, very clean (like the tone has a crew cut). I’ll post as I fiddle about.

The parts for my protoboard have yet to arrive, so you’ll have to stomach my rig…

 

[BuddytheReow]

Let us know the issue when you find it! Breadboarding is a great skill to practice

 

[Coda]

Update: I've been working at biasing the transistors. So far I have Q1 (OC140) at -.41 (20k at R3), Q2 (2n2786) at -.62 (470K at R7), and Q3 (2n1605) at .27 (47R at R8 and R9). Q's 1 and 2 are looking good, but I cannot get the voltage of Q3 any higher. I mean, I could, but I don't have any values smaller that 47R...

This is a work in progress. The point of the session is to prep my FZ-1 PCB build. Thanks to the breadboard, I know that some of the Build Doc values will not work for me (Breadboarding saved my life!)...

 

[Coda]

Update: looks like I made a boo boo. 2n1605 is NPN, not PNP. Makes sense. Now to start plugging in replacements from my stash…

 

[Coda]

Update: found some time this morning to dig through my stash, and I found an MP21 that measures good for Q3. However, now I’m not getting any signal. So, time to go back and double check things.

 

[fig]

Did you check the pinouts?

If you look at it from the bottom with the base at TDC, emitter is left, collector right.

 

[Bricksnbeatles]

Nice! I’m gonna breadboard a Sunn buzz soon, which is essentially just a silicon FZ-1A. Are you dropping down to 3v with an LM317 (or other voltage regulator), or a voltage dividing pair of resistors? Can’t make anything out in the picture since my cell service is weak rn

 

[Coda]

Nice! I’m gonna breadboard a Sunn buzz soon, which is essentially just a silicon FZ-1A. Are you dropping down to 3v with an LM317 (or other voltage regulator), or a voltage dividing pair of resistors? Can’t make anything out in the picture since my cell service is weak rn

I am. I replicated the schematic from the Mister Fuzz PCB, since this is a test for that build.

Did you check the pinouts?

If you look at it from the bottom with the base at TDC, emitter is left, collector right.

Pinout is good. I even built an RG Keen tested circuit on another breadboard (I’ve been wanting to for a while). The issue is that as I tweaked, something most like missed it’s hole. I’ll go over it tomorrow.

 

[fig]

most like missed it’s hole

That's not hard to do, either

 

[Chuck D. Bones]

Yeah, wires pop out, leads touch, these things are fragile. The transistor cases are sometimes hot (electrically), so don't let them touch anything conductive, including each other.