While I like the Noisy Cricket, I wasn't getting as much volume as I wanted, and definitely not enough clean volume before distorting.
Chromespherecom @ diyguitarpedals.com.au came up with the Chime Amp which sounds amazing and has lots of clean output.
A neat feature, if I understand correctly, is that this IC recognizes the difference between an amp speaker load and a headphone load and should operate accordingly.
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This is the first time I've ever even attempted to create a vero layout from a schematic, so if there's something stupid I've done there, so easy. I realize it's a very small and simple schematic, but I'm mostly retarded, so it's a big deal to me.
I've saved your version for my own use as well. I'm so glad you found it useful. It's a great little amp. I've thought about putting this circuit in a little cigar box amp with a little 4ohm speaker along with a SHO or something to throw some dirt on it when desired.
Ok played about with this again and it WILL play with dirt pedals BUT it will motorboat if you try to exceed it`s max volume, so you need to turn the volume of the amp down as you increase the gain or volume of the dirt pedal.
If it wasn't for this website I would definitely have a life.
I just thought I'd mention that I've been using my Punch amp for late night playing, and I have no problem blasting distortion-boxes or boosters with it. My only gripe is that the volume drops alot when the battery is draining.
check out my building blog at www.parasitstudio.se
Just built this. Sounds MUCH better than the 386 amps I've made. Much louder and cleaner.
Swapping the 100k volume for a 1M made it much louder. With the volume all the way up, it just barely starts to distort with humbuckers, and the clipping is not too bad either. This is with a OneSpot at about 9.4v. With a 9v battery (reads 8.4v) its noticeably quieter and more distorted, which I guess it to be expected. Seems more sensitive to voltage than the 386 amps, but not a too big of a deal.
Should also mention, it does not seem to like a boosted input signal. I find if any pedals running into the amp are set far above unity, the IC gets pretty hot. Other wise, it handles any and all pedals I've thrown at it quite well. Fuzz sounds great. As does reverb, delay, etc.
Regarding the issue about motor-boating (I've experienced this myself):
Are you getting this when using it with a power-supply, or only when running on battery power?
The reason I ask is that; lately it struck me that a single 9v battery probably does not have enough milliamps to run a 1 Watt amp at max (and then some...).
And therefore; when the current draw exceeds what the battery can deliver, it results in a lowering of the voltage supplied to the amp, which in itself makes the amp circuit more prone to oscillation and misbehaviour, since this is something that often happens when the battery is low in small amps like these (my experience)
What I suspect is that: when pushing the input of the JFet buffer front-end, the current draw increase quite a bit, exceeding the capabilities of a standard 9v battery.
As far as I understand the JFet transistors: the voltage at Gate has an effect on the (amount of) current-flow to the Drain, and therefore a strong signal at Gate will increase the current consumption (resulting in sag/lower voltage from the battery), and therefore there is no motor-boating/oscillation when lowering the input signal/voltage.
Remember that the IC is doing the amplification involved here, and that it all-ready consumes a fair share of the milliamp capability of the 9v battery. AND: if this current surge happens in the JFet as a result of high gate voltage, it could drain the battery to hard and then also bringing everything down in voltage.
from what I've experienced, it only happens when pushing the input on battery power.
So I guess that it has to be an issue linked to the signal strength/voltage at the Gate of the JFet
Is this correct logic?
Could we be under-estimating our power supply capability, compared to what we are trying to achieve?
Though I have to admit that I do not have any clue about what I am talking about here...
This is just the way my logic works on this subject, based on my limited knowledge...
Great if someone can correct me if I'm way out there! Love corrections!
(If I'm on to something though...), my conclusion will be that: in order to solve the problem, we have to increase the performance of the battery in use (increase milliamp capability), either by running several 9v batteries in parallel, or by using a "stronger" 9v battery.
It would not surprise me that these amps are capable of high power consumption, because you can get a hell of a lot of volume and rage out them, if you push them really hard.
They are great recording amps and they sound HUGE in the mix!
I've had my brother's kids coming into the room holding their ears, complaining about loud volume from an amp like this. That's pretty cool... And that demands POWER!!!
It only oscillates when using a battery. I ran two 9v batteries together and it still oscillated.
I didnt think the milliamps would be much of an issue, as I asumed the Woodrow, being an electra, would not require much. In fact, thats one of the main reasons I chose and electra based circuit. It cant pull more than a few milliamps, no?
Also, the amp only oscillates when the Woodrow is engaged. But the woodrow is still being powered even when not engaged, so it if the milliamps were the issue, the amp would oscillate wether the Woodrow was engaged or not, no?