BAJA Hiwatt DR103 amplifier pedal 9v 120318

bajaman · Post by **bajaman** » 12 Mar 2018, 23:38

Here is my version of the Hiwatt DR103 normal channel preamp and amplifier output stage - I have not built it as yet (waiting on some enclosures) but it should work ok

cheers
bajaman

: baja hiwatt dr103 vero cuts.png (7.95 KiB) Viewed 6345 times

The master volume can be omitted if desired - simply replace it with a 22k resistor and connect the treble control wiper directly to the 2k2 resistor

Ripthorn · Post by **Ripthorn** » 13 Mar 2018, 02:13

'Twould appear that no amp is escaping your grasp! Love it. A Marshall 1974 would be pretty sweet, or a Matchless DC30. I wonder if they would behave anything like the amps...

bajaman · Post by **bajaman** » 13 Mar 2018, 07:58

orange is next

287m · Post by **287m** » 13 Mar 2018, 10:27

like a ritual, not complete without this beast

Frank_NH · Post by **Frank_NH** » 13 Mar 2018, 12:57

Yessss!!

Thanks again Bajaman!

The only question now is whether I package this with a built in Univox Super Fuzz

HENK · Post by **HENK** » 13 Mar 2018, 13:37

This is also for you , BASS-PLAYERS

THANKS ALOT!!!

EddieTavares · Post by **EddieTavares** » 13 Mar 2018, 16:21

bajaman

Cam I use it as a preamp connected directly in a power amp without other preamp? Is it louder enough? Cam I feed it in 18 volts or above?

bajaman · Post by **bajaman** » 13 Mar 2018, 20:36

Cam I feed it in 18 volts or above?

No need - 9v is fine

EddieTavares · Post by **EddieTavares** » 14 Mar 2018, 21:26

bajaman

Cam I use it as a preamp connected directly in a power amp without other preamp? Is it louder enough?

Frank_NH · Post by **Frank_NH** » 15 Mar 2018, 13:21

Eddie,

The output from these circuits is (at least) line level so you can run their output into a power amp with no issues.

I like to view these circuits like the Tech 21 "sansamp" character series (e.g. Leeds, Liverpool, Oxford, California...).

http://www.tech21nyc.com/products/sansa ... eries.html

They give you the sound and mojo of the specific amps, and include the distortion characteristics of both the preamp and power amp. So they are best suited going into a PA or clean amp (or directly into your recording rig). You can add a cab sim to enhance the sound if you like. Speaking of Tech 21, they actually make a "transparant" amp called the Power Engine 60 (amp + cab + 12" speaker), which would be the perfect platform for hosting these Baja pedal designs.

EddieTavares · Post by **EddieTavares** » 16 Mar 2018, 01:47

Thanks Frank_NH

I'm thinking about build a light weight guitar combo with good clean tones. I'll breadboard this circuit and send the signal to a tda based power amp, I'll really like it if it does not sound as compressed as the Sansamp pedals does.

Frank_NH · Post by **Frank_NH** » 16 Mar 2018, 13:06

Sounds like a fun project - let us know how it turns out.

It would be pretty cool to have a DIY version of the Hotone Nano Legacy amp lineup. Pick your amp sim and combine it with a TDA-based power stage on a separate board. Maybe include a cab sim. Stick it in a modest enclosure with a speaker-out jack and there you go!

For reference: http://www.hotoneaudio.com/products/nanolegacy/

287m · Post by **287m** » 16 Mar 2018, 14:41

Frank & Eddie, cool to share tda based poweramp schemo or pointed a some link?

I know, i can borrow Mooer baby bomb. But, have a diy its fun.
Thanks

sixthfloor · Post by **sixthfloor** » 16 Mar 2018, 15:27

Frank_NH wrote:It would be pretty cool to have a DIY version of the Hotone Nano Legacy amp lineup. Pick your amp sim and combine it with a TDA-based power stage on a separate board. Maybe include a cab sim. Stick it in a modest enclosure with a speaker-out jack and there you go!

Depending on the size of the enclosure, adding a couple of switches could allow to choose between multiple amp sims and/or tonestacks and/or cabsims. I've been thinking lately about boxing several of Bajaman's designs in one big box rather than in multiple pedals

Frank_NH · Post by **Frank_NH** » 16 Mar 2018, 17:38

sixthfloor wrote:
Frank_NH wrote:It would be pretty cool to have a DIY version of the Hotone Nano Legacy amp lineup. Pick your amp sim and combine it with a TDA-based power stage on a separate board. Maybe include a cab sim. Stick it in a modest enclosure with a speaker-out jack and there you go!
Depending on the size of the enclosure, adding a couple of switches could allow to choose between multiple amp sims and/or tonestacks and/or cabsims. I've been thinking lately about boxing several of Bajaman's designs in one big box rather than in multiple pedals

My vero layouts are ending up about 2.5" x 2.5" or so, thus multiple sims in a single enclosure is certainly possible. What requires some planning is the layout of the numerous control pots, which is why I like one amp sim per pedal.

So far I've built my Brian May pedal (AC30 normal channel with built in treble boost), and I plan to build the Marshall 1959 Plexi for my Eric Clapton/Cream sound, and this Hiwatt DR103 for my Pete Townsend Live at Leeds sound (perhaps with an optional super fuzz).

mlp-mx6 · Post by **mlp-mx6** » 24 Jun 2018, 01:40

287m wrote:Frank & Eddie, cool to share tda based poweramp schemo or pointed a some link?

I know, i can borrow Mooer baby bomb. But, have a diy its fun.
Thanks

https://www.ebay.com/itm/TPA3118-BTL-Mo ... 2568167198

IT'S TWO DOLLARS!

dorukakkus · Post by **dorukakkus** » 06 Feb 2022, 16:35

Hey this topic is a bit old. But I decided to build this as a combo amp. I want to mimic David Gilmour tones. So this means massive headroom and i want it to work with Big Muffs and Fuzz Faces. So my question is what type of a power amp I should use without being too loud?

Ichabod_Crane · Post by **Ichabod_Crane** » 07 Feb 2022, 09:09

I don't know if I can help you, but I want to ask you what do you mean for "too loud"? To play at home, with a band or in some small pub...
Do you think you need a solid state or tube power amp?

dorukakkus · Post by **dorukakkus** » 13 Feb 2022, 19:34

I play at home mostly but I play in a Band. So maybe 30watts

Ichabod_Crane · Post by **Ichabod_Crane** » 14 Feb 2022, 09:07

I think a TPA3118 mentioned early could be fine. It's 60w, but it's should be pretty cheap and sounds fine enough with a preamp in front. I would like to build an amp with it, too. I advice a PSU at least 18v, and you could try some used for laptop. But pay attention to the voltage of the caps and the op-amp you're going to use for the preamp.
A smaller amp could be an old TDA2030, 30w.

BAJA Hiwatt DR103 amplifier pedal 9v 120318 [documentation]