Working on a guitar amplifier project.
Has a mosfet 100WRMS power amplifier stage.
On the front end it has a gain stage, valve type distortion module, tone controls and echo module.
Has 7 potentiometers for controls. Two switches for distortion and echo on/off.
Will be interesting see what it sounds like.
Waiting for pcb from China.
Has a mosfet 100WRMS power amplifier stage.
On the front end it has a gain stage, valve type distortion module, tone controls and echo module.
Has 7 potentiometers for controls. Two switches for distortion and echo on/off.
Will be interesting see what it sounds like.
Waiting for pcb from China.
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Looks nice, keep us updated.
Have you built a sample (protoboard/perfboard) first or just simulated it?
This kind of designs tends to be iterative, meaning you design - build - test - correct - redesign/tweak -etc. , maybe you´re lucky and hit the jackpot en first try 🙂
Post build pictures and when possible, sound samples 🙂
PS: could read the Power Amp without big trouble but old worn eyes had difficulty with preamp image, do you have more detailed/larger one?
Say 2X larger.
Have you built a cabinet for it or you still keep your old FANEs?
Have you built a sample (protoboard/perfboard) first or just simulated it?
This kind of designs tends to be iterative, meaning you design - build - test - correct - redesign/tweak -etc. , maybe you´re lucky and hit the jackpot en first try 🙂
Post build pictures and when possible, sound samples 🙂
PS: could read the Power Amp without big trouble but old worn eyes had difficulty with preamp image, do you have more detailed/larger one?
Say 2X larger.
Have you built a cabinet for it or you still keep your old FANEs?
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I designed a guitar amp a few years back almost the same but without echo.
I sold it on and the bloke was delighted with the sound.
The echo circuit is new so I will have to see how it sounds on the pcb.
I didnt prototype it as pcb's are so cheap now and it was made in with a batch of others so cost very little to make.
I sold it on and the bloke was delighted with the sound.
The echo circuit is new so I will have to see how it sounds on the pcb.
I didnt prototype it as pcb's are so cheap now and it was made in with a batch of others so cost very little to make.
Just started on soldering in components.
Top right is power amp.
Power supply top left.
Bottom is audio in, valve distortion module, tone control and echo module.
Top right is power amp.
Power supply top left.
Bottom is audio in, valve distortion module, tone control and echo module.
PT2399 is designed for al-cheapo karaoke machines. The delay range is restricted and sound quality degrades audibly with longer delays of several 100ms. I made a PCB for it several years ago and found the outcome disappointing. There is not much to expect from a device that costs about 1€.
Its just for a guitar so hi fi quality is not required.
Will see how it sounds, can always try something different next time if it isnt any good.
I made the pcb modular deliberately so I can switch out echo if its no good.
I can also adjust the echo time delay so its not poor quality if required.
Will see how it sounds, can always try something different next time if it isnt any good.
I made the pcb modular deliberately so I can switch out echo if its no good.
I can also adjust the echo time delay so its not poor quality if required.
Built up the low level audio end and it sounds ok.
The echo works as expected.
Waiting for amp heat sink, transformer and enclosure.
The echo works as expected.
Waiting for amp heat sink, transformer and enclosure.
Had a go at front panel today.
7 pots, 2 switches and one jack socket to drill.
Measured 25mm from bottom of panel to pots etc.
Somewhere between measuring and drilling the 25mm got changed to 15mm !
So had to order a new panel.
Measure 3 times and drill once !
7 pots, 2 switches and one jack socket to drill.
Measured 25mm from bottom of panel to pots etc.
Somewhere between measuring and drilling the 25mm got changed to 15mm !
So had to order a new panel.
Measure 3 times and drill once !
Ouch!!!!
That said, pots being 16mm diameter, drilling holes 15mm away from one panel edge should stand like a sore thumb as "WAY too close", measurements be d*mned.
At least, weird enough to make you think "wtf? is this right?"
Please keepus informed,showsomepicturs, etc.; this WILL end well.
Have you already thought about the head case/cabinet?
That said, pots being 16mm diameter, drilling holes 15mm away from one panel edge should stand like a sore thumb as "WAY too close", measurements be d*mned.
At least, weird enough to make you think "wtf? is this right?"
Please keepus informed,showsomepicturs, etc.; this WILL end well.
Have you already thought about the head case/cabinet?
They are just small pots and dont fit by about 2mm !
But they would short on panel bend.
I did notice the front panel was a very tight fit in the rack case.
I looked up one a little smaller on ebay so will use that.
SO maybe not such a disaster to lose the current one.
I am using a 4u 19 inch rack case. Cheapest option at £30. The sky's the limit for a nice case. Will fit a fan and vent to get good airflow.
But they would short on panel bend.
I did notice the front panel was a very tight fit in the rack case.
I looked up one a little smaller on ebay so will use that.
SO maybe not such a disaster to lose the current one.
I am using a 4u 19 inch rack case. Cheapest option at £30. The sky's the limit for a nice case. Will fit a fan and vent to get good airflow.
Progressing slowly waiting for parts to come in.
Bolted volume controls to front panel and soldered them into pcb.
Messed up with distortion and echo switches and bought none latching ones.
Amp didnt work first time had 45 V on output !
Missed putting in R30 22k input resistor.
Works ok now with an mp3 player. Sounds good and clean.
DC offset and bias setup.
Bought a vented back panel so I can use a fan with it.
case is huge, could have got away with 3U high and about 2/3 depth.
Will find a smaller case next time.
Bolted volume controls to front panel and soldered them into pcb.
Messed up with distortion and echo switches and bought none latching ones.
Amp didnt work first time had 45 V on output !
Missed putting in R30 22k input resistor.
Works ok now with an mp3 player. Sounds good and clean.
DC offset and bias setup.
Bought a vented back panel so I can use a fan with it.
case is huge, could have got away with 3U high and about 2/3 depth.
Will find a smaller case next time.
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Hey, looking GOOD!!
At first thought "4U" panel was a typo, "too tall", but now I see you mean it 😱
Shades of Orange? 🙂
At first thought "4U" panel was a typo, "too tall", but now I see you mean it 😱
Shades of Orange? 🙂
Its a black 4u rack case 19 inch by 430mm
I could just about get away with half the depth.
The front and back panels are steel which is harder to drill and is heavy.
I could have done with a couple of aluminium panels.
I could just about get away with half the depth.
The front and back panels are steel which is harder to drill and is heavy.
I could have done with a couple of aluminium panels.
Got it about 99% finished.
I have ordered a 20mm high panel with all the controls names on it.
Better than sticky labels !
I have ordered a 20mm high panel with all the controls names on it.
Better than sticky labels !
Looking good 🙂
Will look even better with labelled controls; don´t forget to order a large Logo too.
What brand/model will it sport?
Or you could order a large full panel size gold or silver sticky sheet
or in many flat colours:
Order a few large logos too, to apply on matching cabinets.
Whenever possible, upload some sound samples 🙂
Will look even better with labelled controls; don´t forget to order a large Logo too.
What brand/model will it sport?
Or you could order a large full panel size gold or silver sticky sheet
or in many flat colours:
Order a few large logos too, to apply on matching cabinets.
Whenever possible, upload some sound samples 🙂
Will probably just leave it with controls panel aluminium panel.
Had a bit of a play tonight.
Distortion goes from fairly clean to dirty.
Echo goes from none to a deep echo.
The echo chip is just a cheapie so I wasn't expecting much but its fine for a guitar amp.
The power amp in it can manage 150WRMS so it is very loud.
Had a bit of a play tonight.
Distortion goes from fairly clean to dirty.
Echo goes from none to a deep echo.
The echo chip is just a cheapie so I wasn't expecting much but its fine for a guitar amp.
The power amp in it can manage 150WRMS so it is very loud.