Search found 86 matches

by microbailey
31 Dec 2022, 20:27
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

So is it possible to hook up an external speaker without that amp circuit boaerd? The amp circuit board is essential for the speaker - it contains the power amp. You could remove the existing speaker and re-wire another in its place - but note bmxguitars' comments. The whole pre-amp is EQ'd for the...
by microbailey
20 Jan 2022, 23:02
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 44
Views: 35805

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

Do you think the Tdynamics circuit on the newer version of the bandit (cyclops logo) works the same way? Adding the same 47/50k after the Tdynamics could let me reduce the crancked watts? I honestly don't know. I can see that the schematic posted by steben is not so far from the Red Stripe Bandit I...
by microbailey
15 Jan 2022, 22:31
Forum: Amplifiers
Topic: My mission to modify a Peavey Bandit 112 into a boutique amp
Replies: 44
Views: 35805

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

Hi steben Did you manage to record some tones? No still didn't get around to recording dome demos with this amp. Have been busy on designing Blackstar amp mods and forgot about this tbh! It's back on my list of stuff to do again now. I swapped the speaker with Eminence Swamp Thang and it became such...
by microbailey
25 Aug 2021, 13:41
Forum: Parts & Tools Sourcing & Trading
Topic: Half-way down latching PCB push switch?
Replies: 7
Views: 1381

Re: Half-way down latching PCB push switch?

Sorry to clarify this is not for a foot switch! (I have enough trouble oprating my looper pedal as it is :roll: ) it's for a miniature PCB panel switch.
Yes could do with length of presses but that assumes my circuit is digital and I have led status.
by microbailey
24 Aug 2021, 22:56
Forum: Parts & Tools Sourcing & Trading
Topic: Half-way down latching PCB push switch?
Replies: 7
Views: 1381

Half-way down latching PCB push switch?

Toying with some new pedal build ideas and just wondering if anyone has ever seen a pedal-sized PCB-mount push-button switch which has a 'half-way down' position as well as a full-way down position? Both latching states. I could be raving mad :D but I'd imagine it working like this Position 1: Unpre...
by microbailey
07 Jan 2021, 22:38
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

Thank you microbailey! I really appreciate you verifying that. So, that is interesting. I have a whole bunch of TLC2272. I shot them out with some buddies in the Friedman BE-OD circuit and in blind test, the TLC 2272 sounded the least good. (The stock tl072 sounded best). I really wanted to like th...
by microbailey
06 Jan 2021, 22:07
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

Once again, excellent work Microbailey. Very interesting. On this op-amp in the preamp: Is this a TLV272? Or Possibly a TLC2272? I haven't been able to find a TLV2272, as notated on the scheme. The TLV272 does seem to fit the bill. Rail-to-rail mos op-amp. I was impressed with how good this stage s...
by microbailey
29 Dec 2020, 22:09
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

I've now finished tracing the Blackstar Fly3 practice amp. Was a bit more to it than I expected when I started :shock: All the schematics are up on my website (see links below). Here is a block diagram I drew up of the amp Blackstar_Fly3_block_diagram.png Probably more useful for everyone, here is a...
by microbailey
18 Dec 2020, 19:14
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

For reference I just added the Top Deck board (upper board) schematic on: http://www.midboost.com/workbench/blackstar-fly-3-pt2#blackstar-fly-top-deck-board Not that there's much on it :) I've also added some discussion of the Blackstar Fly3 speaker design were I worked out (approximately) the bass ...
by microbailey
13 Dec 2020, 23:53
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

As yoon_seri and others had asked earlier in this thread about the ground connections in the Blackstar Fly 3, I have put a section on the grounding, with diagrams, here: http://www.midboost.com/workbench/blackstar-fly-3-pt2#audio-ground-routing-and-why-it-matters which explains the reasons why the g...
by microbailey
07 Dec 2020, 16:34
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

Thanks guys :applause: and thanks The G for the SPICE sims. I had initially thought 'common base amplifier', but couldn't see any way the NPN could be biased on without some extra resistor from base to a positive voltage (with respect to emitter). I've checked and checked again and I can't see any s...
by microbailey
02 Dec 2020, 23:41
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

I've now found time to draw the schematic for the power supply section of the Blackstar Fly3, and add a bunch of circuit analysis around it. For those interested, my schematic is here: http://www.midboost.com/workbench/blackstar-fly-3-pt2#blackstar-fly3-power-supply-schematic There's a part of the c...
by microbailey
26 Nov 2020, 08:42
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

Thanks for explaining. For a ground loop you can try 2 things. One is isolating the supply (as you suggest), the other is lifting (disconnecting) a shield on the load end of the audio cable between the pieces of equipment. For isolating the supply the problem you'll have is the Fly runs off 6.5v and...
by microbailey
25 Nov 2020, 23:12
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

Hello @microbailey Great job on this! I have few questions. Upon checking your diagrams here: https://static.ucraft.app/fs/ucraft/userFiles/midboost/images/215-blackstarfly3speakerpcb.jpg?v=1594590407 http://www.midboost.com/workbench/blackstar-fly-3#m251 Since the #3 and #4 wire of the 4-wire ribb...
by microbailey
25 Nov 2020, 22:54
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

There's no whine when the Fly 3 is on batteries. Ok that's good as it means the amp is fine. Just to be sure - are you saying the whine is not there with your rig exactly as you had it to start with and the only change you made is to run the Blackstar on batteries instead of a mains PSU? If so then...
by microbailey
22 Nov 2020, 22:37
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

Thank you for all your work and explanation. The FLY 3 is a truly classy piece of plastic! I've just tried using my FLY 3, with its extension cab, as the Dry amp in my Wet-Dry rig instead of using two heavyweight Marshall 6101s. It sounds really good, but unfortunately when it and one of the Marsha...
by microbailey
20 Nov 2020, 23:06
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

I think your analysis is correct- It is a more subtle bandpass. Less subtle than a first order passive bandpass though! Great job on this thread. I have found it quite interesting. I may breadboard out that delay circuit to see how it acts in real life :) Thanks bmx. Yes it looks like a bandpass fr...
by microbailey
17 Nov 2020, 23:30
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

I have a question for any other EEs reading this (maybe I should be posting this on EE StackExchange instead :) ) I notice that Blackstar's engineers have frequently used the type of op-amp filter shown in the first stage of the circuit below (taken from just after the Fly3's ISF tone stack) Post_EQ...
by microbailey
14 Nov 2020, 19:28
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

I've traced and drawn the schematic for the pre-amp now :D It's on http://www.midboost.com/workbench/blackstar-fly-3#guitar-pre-amp-and-gain-stage I've started some analysis and I ran SPICE on the filter at the guitar input - its a gentle bandpass centred on 2kHz. I'm just starting to look into the ...
by microbailey
03 Nov 2020, 23:46
Forum: Amplifiers
Topic: Circuit for a Blackstar Fly 3 watt amp?
Replies: 57
Views: 17931

Re: Circuit for a Blackstar Fly 3 watt amp?

The full Backstar Fly3 EQ circuit (pre/post tone-stack and ISF) is now drawn up and posted on http://www.midboost.com/workbench/blackstar-fly-3#blackstar-fly3-full-eq-schematic Hopefully the link works this time :wink: Next I'll draw up the pre-amp input stage (including overdrive channel). It's get...