Exactly. Acetic acid smells like vinegar. So if it smells like vinegar you can't use it.
Elm327, I'm however not surprised you have trouble finding anyone that even knows what you're talking about as water based non-corrosive silicons have been standard in the Nordic countries for at least the last 20 years. It is exceptionally hard to find an acetic acid based silicone based here anymore if not ordered specifically.
The whole point about it was more directed at builders in countries where acetic based silicones are still stock items at hardware stores.
I'm planing on building a boominator. The speakers i will use is P.Audio HP HP-10W and P.Audio PHT-407N. The amp im planning to use is a Maxamp20, will this be enough? And what resistor and filters should i use ? I'm quite a newbie to this so if someone would have a wiring diagram with all components one i would be very glad
I bought some silicon substitut tec7, more expensive but i don't need more than a tube.
Thank you Saturnus for all your work!
Mange: I have exactly the same components in my build, i use 47 ohms 3w metalfilm resistors from elfa.
The swedish computerforum Sweclockers have their own thread on the boominator, i found the electronic schedule there. Boominator-tråden (även övriga musiklådor) - Ljud - SweClockers.com
Thank you Saturnus for all your work!
Mange: I have exactly the same components in my build, i use 47 ohms 3w metalfilm resistors from elfa.
The swedish computerforum Sweclockers have their own thread on the boominator, i found the electronic schedule there. Boominator-tråden (även övriga musiklådor) - Ljud - SweClockers.com
You can't use a resistor if you're using pht-407n tweeter instead of a piezo. It will be destroyed almost immediately. Please consult the needed passive filter posted in this thread.
Rather than trying to chase down silicone, I just used PL urethane on the backs of my cheap piezos, since I was using it to build the enclosure anyway...
Hello again
My blue aran order has been delivered so I've been hunting down everything else I need to get started. I'm just going to chuck some links here and I'm hoping I can get a thumbs up or down for each.
I can't find wisa-form but I can get hexa-grip, a viable substitute?
WISA-Hexa Grip
47 ohm resistor, right one?
ERG3SJ470 - PANASONIC - RESISTOR METAL FILM, 47OHM, 5%, AXIAL | Farnell element14 UK
Liquid metal?
Unibond 360767 Repair Metal For Good 280ml | General Purpose Sealants | Screwfix.com
Silicone?
No Nonsense Builders Silicone Clear 310ml | Building Sealants | Screwfix.com
Long shopping list but hopefully the right components.
My blue aran order has been delivered so I've been hunting down everything else I need to get started. I'm just going to chuck some links here and I'm hoping I can get a thumbs up or down for each.
I can't find wisa-form but I can get hexa-grip, a viable substitute?
WISA-Hexa Grip
47 ohm resistor, right one?
ERG3SJ470 - PANASONIC - RESISTOR METAL FILM, 47OHM, 5%, AXIAL | Farnell element14 UK
Liquid metal?
Unibond 360767 Repair Metal For Good 280ml | General Purpose Sealants | Screwfix.com
Silicone?
No Nonsense Builders Silicone Clear 310ml | Building Sealants | Screwfix.com
Long shopping list but hopefully the right components.
As far as I know all 200 got sold out the same day as they came in stock. Probably due to a lot of pre-orders.
It might be worth checking the usual channels to see if there's any in stock there.
I do recommend to use Muse TP2020 based boards, sounds better, is cheaper and has larger input caps (=works better when used with a wall socket AC/DC adapter) than the Maxamp20 and the difference in power is neglitable. The power is imho enough.
Another alternative is the Lepai LP2020A+ (also TP2020 Chip), does cost a little less than the maxamp20 (but more than the Muse), is much bigger and has less outputpower than the Maxamp20, but sounds very nice, is already cased, also has no problem when used with a wall socket, and as biggest feature has bass&treble control on it.
If you want to go higher than what these amps can deliver you need 24V or more - for example with an good step-up booster module (150W or something, to push your 12V battery to 24-32V DC, usual ones have an effeciency of about 80-90%) and depending on used amplifier maybe also additional input caps (as step ups may produce buzzing). Or of couse you could also use a second 12V battery and put them in a row to get 24V. I do recommend TK2050 (HiFimeDIY.com has good ones) or cheap 2.0 (not 2.1, a few of them aren't good) TPA3116 based (needs less idle power than TK2050 but doesn't sound exactly as nice for my ears) boards, you can easily get 2x50W to 2x100W or even more.
Instead of that you could also use 12V car amplifiers which have a step-up build in, but generally they are less energy-efficient and more expensive.
Last edited:
Hi all ! First post here. loudspeakers Plus will have a new batch of speakers from P-Audio coming in about 6weeks. They have 1set left if anybody's interested.
Me and my friend are about to make the final order for the Boominator.
Accusafe measured our piezos with a LCR meter, which probably measures at 1khz. The tweeters were around 90nf, when calculating a 3.5khz RC HPF that translates to +/-500 ohm. That's more than a factor 10 higher than the recommended 47 ohm.
We really want to begin building on Monday (christmas holiday 🙂). Was the 47 ohm measured with the Monacor's or the Motorola's? Otherwise we'll order 47 and 150 ohm resistors and try what sounds better.
By the way: can we wire the piezos parallel so that they only needs one resistor (half of the value ofc) per channel?
Accusafe measured our piezos with a LCR meter, which probably measures at 1khz. The tweeters were around 90nf, when calculating a 3.5khz RC HPF that translates to +/-500 ohm. That's more than a factor 10 higher than the recommended 47 ohm.
We really want to begin building on Monday (christmas holiday 🙂). Was the 47 ohm measured with the Monacor's or the Motorola's? Otherwise we'll order 47 and 150 ohm resistors and try what sounds better.
By the way: can we wire the piezos parallel so that they only needs one resistor (half of the value ofc) per channel?
Last edited:
47Kohm match the Monacors well.
You could wire it using only one resistor however, the Motorola white paper specifically recommends using one resistor in series with each piezo regardless if it's parallel or series connected.
You could wire it using only one resistor however, the Motorola white paper specifically recommends using one resistor in series with each piezo regardless if it's parallel or series connected.
47 ohm right? If Motorola says so, sure why not. Won't be cheaping out on resistors ;p.
Was 1W adequate?: https://www.conrad.nl/nl/metaalfilmweerstand-47-axiaal-bedraad-0414-1-w-1-stuks-419400.html
Higher power ones are power resistors and I think I remember you not recommending them due to parasitic inductance.
Was 1W adequate?: https://www.conrad.nl/nl/metaalfilmweerstand-47-axiaal-bedraad-0414-1-w-1-stuks-419400.html
Higher power ones are power resistors and I think I remember you not recommending them due to parasitic inductance.
Last edited:
Those are metalfilm, which are recommended.
We placed the order on the 1 watt resistors. If Saturnus says 1 watt is not enough we'll have to buy some new resistors. If they burn up while installed there is no way of replacing them without screwing the box up.
We placed the order on the 1 watt resistors. If Saturnus says 1 watt is not enough we'll have to buy some new resistors. If they burn up while installed there is no way of replacing them without screwing the box up.
1W is fine for most configurations. If you're planning on running it off a 24V amplifier (around 50W) I do recommend 2W ones for the added safety although they'd hardly see more than 0.1W dissipated across them on average.
And yeah, typo earlier 47ohm, not 47Kohm.
And yeah, typo earlier 47ohm, not 47Kohm.