Search found 48 matches

by microbailey
12 Jul 2020, 23:26
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 5
Views: 437

Re: Circuit for a Blackstar Fly 3 watt amp?

I finally got around to tracing the speaker board (the Class D power amplifier) i the Blackstar Fly 3 and drew it up as a proper schematic in KiCad https://static.ucraft.app/fs/ucraft/userFiles/midboost/images/215-blackstarfly3speakerpcb.jpg?v=1594590407 It's pretty much the circuit from the DIODES ...
by microbailey
03 Jul 2020, 23:23
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 5
Views: 437

Re: Circuit for a Blackstar Fly 3 watt amp?

Ok so I finally got time to dismantle my Blackstar Fly 3 again and start prodding around with my magnifying glass, my scope and a multimeter. My suspicions are confirmed - its a Class-D switching amp which explains why its so loud for a battery amp. I stuck my scope on the speaker terminals, with no...
by microbailey
13 Jun 2020, 22:32
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 5
Views: 437

Re: Circuit for a Blackstar Fly 3 watt amp?

Hi plush The amp's put back together for now. When I next dismantle it I'll try to post some shots. In the meantime I found some pics of the main board online here: https://picclick.com/Blackstar-Fly-3-Mini-Guitar-Amp-PCB-Circuit-292913367030.html (I hope its within forum rules to post that link :wi...
by microbailey
11 Jun 2020, 23:04
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 5
Views: 437

Circuit for a Blackstar Fly 3 watt amp?

The Blackstar Fly 3W amp is pretty loud so I took mine apart to see what they used for the driver (great little guitar practice amp btw). It's almost all SMD although wouldn't be too hard to trace if I felt inclined as most of the PCB tracks are on the top layer on each board (there are 4 PCBs in to...
by microbailey
06 May 2019, 00:54
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 38
Views: 15728

Re: My mission to modify a Peavey Bandit 112 into a boutique

Hi L_C Sorry its taken me so long to reply to your post! You probably got your answers somewhere else now. Question1: would it be very different to build a preamp and insert it in the loop? Nope - in fact that would be a pretty easy way to do what I did. One of the great things about the Bandit is t...
by microbailey
12 Oct 2018, 20:22
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 38
Views: 15728

Re: My mission to modify a Peavey Bandit 112 into a boutique

It's been a while but for anybody who's still interested in this project I thought I'd report what I did to fix the tone problems I had on the modified Bandit lead channel. In my post when I first tested the modified Bandit I'd said the Dirt channel was way too dark and muddy for a Plexi style overd...
by microbailey
28 Jun 2018, 21:55
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 38
Views: 15728

Re: My mission to modify a Peavey Bandit 112 into a boutique

It took a while but I can now give a tone report having used the amp at gig volume and with some pedals last night for the first time. The good: I'm really impressed with the clean channel! Both settings (the original "Modern" and my new "Vintage") sound great with the Jensen, and very different to ...
by microbailey
26 Jun 2018, 23:02
Forum: Amplifiers
Topic: Kustom X MPA Mono Power Amp
Replies: 2
Views: 1287

Re: Kustom X MPA Mono Power Amp

Hi and welcome.
Did you try contacting Kustom and asking for a service schematic? I see they have a customer service and parts dept contact email on their website (assuming we're talking about the same company).
by microbailey
21 Jun 2018, 23:20
Forum: DIY Stompbox designs
Topic: What are the challenges to designing a discrete LM3080N
Replies: 9
Views: 4063

Re: What are the challenges to designing a discrete LM3080N

Hi Belanger88. To answer your question its hard to replicate the exact behaviour of an analog circuit designed for a die (the piece of silicon in side a part like an op-amp) with discrete parts for several reasons (I'm sure there's more but these are the ones that spring to mind): 1) as already said...
by microbailey
07 Jun 2018, 22:56
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 38
Views: 15728

Re: My mission to modify a Peavey Bandit 112 into a boutique

Thanks Nocentelli. Sorry for delay - I've been busy building (garden walls that is, not pedals!) Here are some pics of the finished amp as promised Finished_Bandit_1.jpg Finished_Bandit_2.jpg Finished_Bandit_3.jpg Finished_Bandit_4.jpg Finished_Bandit_5.jpg I bought the new knobs from eBay, about £4...
by microbailey
30 May 2018, 23:35
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 38
Views: 15728

Re: My mission to modify a Peavey Bandit 112 into a boutique

I know I said it was almost done but I couldn't resist just one more small mod :D The Bandit is a pretty loud amp and I'd like to be able to drive the Clean and Dirt channels hard yet still reduce the output (for example at home practice), while retaining the option of higher power for gigging, I th...
by microbailey
25 May 2018, 22:59
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 38
Views: 15728

Re: My mission to modify a Peavey Bandit 112 into a boutique

How to change a Bandit Red-Stripe into a Silver Stripe! (not really but here's how the cosmetic makeover and speaker change went) First I had to take my Bandit apart - I'd already taken the amp chassis out and disconnected the reverb tank at the beginning of this project. But now I needed to remove...
by microbailey
20 May 2018, 23:01
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 38
Views: 15728

Re: My mission to modify a Peavey Bandit 112 into a boutique

Thanks Cub :cheers It's getting close to the end now I think! I thought I'd try some basic testing of everything together now (modified pre-amp and power amp boards). As you can see this was just wiring up a speaker on a table, with the pre-amp and power amp boards mounted back into the amp chassis ...
by microbailey
15 May 2018, 22:47
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 38
Views: 15728

Re: My mission to modify a Peavey Bandit 112 into a boutique

So, experimenting with the LEDs (now they've arrived) I find that actually the Orange LED is too bright compared to the blue, so I'm increasing the series current limit resistor to 470R (same as the blue). Also I found spare contacts on the S3 channel select switch to use for controlling the LEDs so...
by microbailey
10 May 2018, 23:00
Forum: Pimp-My-Cheap-Pedal
Topic: BOSS GE-7 Capacitors
Replies: 3
Views: 2175

Re: BOSS GE-7 Capacitors

Just to add that for a graphic EQ pedal like the GE-7 the most important thing (IMHO) is to get the replacement caps to match the original designed values since the filters are tuned to specific freqs and if the caps are off those bands will move and the pedal will sound different to intended. So yo...
by microbailey
10 May 2018, 22:51
Forum: DIY Stompbox designs
Topic: Footswitch with non LED ON/OFF Indicator?
Replies: 3
Views: 1524

Re: Footswitch with non LED ON/OFF Indicator?

Way back in the late 70s (before LEDs were cheap and plentiful) I remember a panel-mount push switch which when pressed mechanically revealed a highly reflective lime disk open so it gave the impression of being illuminated. The trouble was it only worked if there was plenty of light around to start...
by microbailey
10 May 2018, 00:06
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 38
Views: 15728

Re: My mission to modify a Peavey Bandit 112 into a boutique

As promised here's the re-drawn schematic including all the changes I've done so far to the Clean and Lead channels on the Bandit pre-amp board. I've used this to fix a few errors which I'd made in earlier posts (and I expect introduce a few new ones :D ). I've tweaked 1 or 2 values along the way an...
by microbailey
07 May 2018, 16:55
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 38
Views: 15728

Re: My mission to modify a Peavey Bandit 112 into a boutique

I've now done the mods to the Bandit pre-amp PCB for the dirt channel changes I've been describing. As before I've removed a lot of components (the ones marked with a red cross in my schematics) and added a few others or changed their value. Here are some close-up pics of the modified board: Dirt_ch...
by microbailey
07 May 2018, 01:05
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 38
Views: 15728

Re: My mission to modify a Peavey Bandit 112 into a boutique

I looked at the post-dirt stages "Lead" channel EQ on the Bandit. ... There a high-pass formed by C20 + R94 (only when S2C is in Down or Up positions). There's a double low-pass formed by R34 + C32 (only when S2C in Middle position) and R35 + C33. So this overall forms a sometimes band-pass (Down o...
by microbailey
19 Apr 2018, 23:40
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 38
Views: 15728

Re: My mission to modify a Peavey Bandit 112 into a boutique

I looked at the post-dirt stages "Lead" channel EQ on the Bandit. Here's what's there (apologies for my crappy handwritten schematics cos I'm too lazy to use schematic software): Bandit_post_dirt_EQ_original.jpg There a high-pass formed by C20 + R94 (only when S2C is in Down or Up positions). There'...