i will make some time in the weekend to fill one TA2022 amp old version board with parts, since i don't have complete any more, and check. i will give the explanations after that.
Hi CNX,
Is your 8920 board the same as 8920B, or are they separate products?
I have a TA2024 amp driving TB-871 fullrange drivers (15w/30w max), and I need a bit more power. I'm guessing the 3020 will be unsuitable (always in the very bottom range of output), and the 2022 still a little bit big for this? Sorry for a newbie question.
Is your 8920 board the same as 8920B, or are they separate products?
I have a TA2024 amp driving TB-871 fullrange drivers (15w/30w max), and I need a bit more power. I'm guessing the 3020 will be unsuitable (always in the very bottom range of output), and the 2022 still a little bit big for this? Sorry for a newbie question.
col said:
not so fast... i made it last night. the reason why i didn't finished last weekend was that i needed to assembly one empty board and i haven't all the parts. i needed the small inductor and i just got it yesterday, 500pcs. they didn't have on stock and i had to order, since nobody care if u need one or 10 pcs of something (i need just one pcs. the others will wait for some other things).
i will attach a photo where can see what and where need to change. basically need to supply the audio signal directely on the IC on the pins 23 and 26, as close as possible to the IC, avoiding the high power/frequency area.
need to cut the tracks from pins 23 and 26 which go to the input connector, but cut after the connection to the resistors from pins22 and 25. after that need to connect one resistor of 20K (this resistor will determine the voltage gain of the amp) and one capacitor (1-10uF) in series, with + towards the IC and - to the input.
the GND copper pour should be connected as can see in the picture close to the power connector GND and/or Speaker GND.
with this modification i successfully reduced the noise floor with about 17dB compared with the previous value. keep in mind that need a start-up delay circuit or speaker protection circuit to avoid the start-up burst.
TA2022 version 2 is completely remade, the layout, the schematic, and doesn't have any of this issues. you should try this one.
col said:
not so fast... i made it last night. the reason why i didn't finished last weekend was that i needed to assembly one empty board and i haven't all the parts. i needed the small inductor and i just got it yesterday, 500pcs. they didn't have on stock and i had to order, since nobody care if u need one or 10 pcs of something (i need just one pcs. the others will wait for some other things).
i will attach a photo where can see what and where need to change. basically need to supply the audio signal directely on the IC on the pins 23 and 26, as close as possible to the IC, avoiding the high power/frequency area.
need to cut the tracks from pins 23 and 26 which go to the input connector, but cut after the connection to the resistors from pins22 and 25. after that need to connect one resistor of 20K (this resistor will determine the voltage gain of the amp) and one capacitor (1-10uF) in series, with + towards the IC and - to the input.
the GND copper pour should be connected as can see in the picture close to the power connector GND and/or Speaker GND.
with this modification i successfully reduced the noise floor with about 17dB compared with the previous value. keep in mind that need a start-up delay circuit or speaker protection circuit to avoid the start-up burst.
TA2022 version 2 is completely remade, the layout, the schematic, and doesn't have any of this issues. you should try this one.
Jakpipe,
the TDA8920TH and TDA8920BTH use the same pcb, just the ic is different. if your meaning is about the price, is same for 8920BTH as for 8920TH, just need to mention which one do you preffer when you place an order. regardin your question, although some companies which selling loudspeakers recommend to use an amplifier with at most same power as the loudspeaker, i can say that is better to use an amplifier with higher power rating (ussualy 1.5-2 times) because you have the power reserve, even if you will never use the amplifier at maximum output level, and most important, for the required power level, you are in the "audiophile" range, most of the amplifiers have their best sound quality between 10 - 60% of their rated output power.
you shoould take care to not use more power than the loudspeakers can admit, otherwise you can damage them.
for your needs, TDA8920 amplifier or TA2022 amplifier will be a good choice, TA3020 amplifier is far too big.
Attachments
ahh...ok, I better blow the dust off! Did you say you have a photo though? Those directions are a bit hard to follow without a illustration.
Edit: you must have posted the photo while I was writing this.
cheers,
col.
Edit: you must have posted the photo while I was writing this.
cheers,
col.
i tried few times to post, and every time end-up with error. eventually i post the photo also.
i made few more tests for the TA3020 v2 boards and i made some photos also.
for the power supply i use, 2x45V AC at 10A each.
load resistors are 4ohms at 100W each.
i got 37.8V at 0.31 % THD. in means of power, this is 357 W.
i made few more tests for the TA3020 v2 boards and i made some photos also.
for the power supply i use, 2x45V AC at 10A each.
load resistors are 4ohms at 100W each.
i got 37.8V at 0.31 % THD. in means of power, this is 357 W.
Attachments
how good is the noise floor with the new TA2022? I need something with really low noise as I'm powering a very sensitive pair of compression drivers in a tri-amp system. I'm currently using the TA3020 but want to move it down to the mids.
I will make a new order soon but want to wait until you have the SMPS for DA-1 available. I also want to try your speaker protection module. I know you will cut me a good deal seeing I already have a old TA2022 that I can't use without heavy modification 😉
BTW the TA3020 sounds great!
col.
I will make a new order soon but want to wait until you have the SMPS for DA-1 available. I also want to try your speaker protection module. I know you will cut me a good deal seeing I already have a old TA2022 that I can't use without heavy modification 😉
BTW the TA3020 sounds great!
col.
i tried few times to post, and every time end-up with error. eventually i post the photo also.
i made few more tests for the TA3020 v2 boards and i made some photos also.
for the power supply i use, 2x45V AC at 10A each.
load resistors are 4ohms at 100W each.
i got 37.8V at 0.31 % THD. in means of power, this is 357 W.
i made few more tests for the TA3020 v2 boards and i made some photos also.
for the power supply i use, 2x45V AC at 10A each.
load resistors are 4ohms at 100W each.
i got 37.8V at 0.31 % THD. in means of power, this is 357 W.
i measured 94.8 dB S/N ratio with input shorted with about 30cm wires. should be more if i short the wires directely on pcb. anyway, the maximum S/N ratio for this IC is 102 dB.
i hope i will have the supply for DA-1 and for TA3020 next month, i made the prototype already, and i need to order the transformers and all the other parts needed.
for the TA2022 just need to move that pars on the other side more close to the IC. need to spend between 20min to one day, dependind on the skils which you have ;-)
if you want to buy the new version of TA2022 i will make good discount for you, and for others who bought the first version, for this we can discusse by mail or pm.
i hope i will have the supply for DA-1 and for TA3020 next month, i made the prototype already, and i need to order the transformers and all the other parts needed.
for the TA2022 just need to move that pars on the other side more close to the IC. need to spend between 20min to one day, dependind on the skils which you have ;-)
if you want to buy the new version of TA2022 i will make good discount for you, and for others who bought the first version, for this we can discusse by mail or pm.
Attachments
Could you change your sign in/registration pages from http to https? I was trying to register so I could buy some some of your products, but I noticed the pages were not secure. The registration page requires information about me that makes it really easy for someone to use for identity theft. You can get really cheap SSL certificates here, or you can even create your own self signed certificates.
I want to make sure none of the information I submit to your site will be intercepted along the way.
I want to make sure none of the information I submit to your site will be intercepted along the way.
Yes, I made similar remarks to Cristy. For ordering you actually just need an email address to pay with paypal and registering and e.g. providing you birth date should have nothing to do with it. He actually mentions on his webpage "we do NOT guarantee the security of the hosting server". Then I would suggest: just don't ask for more personal information than necesarry for ordering.
Well... interesting (although a bit OT) debate.
[OT BEGIN]
I do agree that it's pointless to ask for useless personal information especially because payment is done via Paypal (which is btw an easy and safe enough approach).
Then what will https REALLY bring ?
Tunneling ?
hmmm, yes it could but it's not as secure as you may think. What's the purpose ? avoiding someone one same subnet sniffing your personal data over the network ? Sure it help but it's not "so" safe.
- Is your provider using some proxy able to seat transparently in the middle still accessing "encrypted" data ? (yes, this works
)
- is there any reverse proxy on the other side close to this server you try to reach ?
It's something required within companies, I mean on LAN where you don't want other people to retrieve sensitive data (e.g. your personal password) but in our case, I don't think it's the main purpose.
Why ?
Because depending on where this web site is hosted, being on same LAN to sniff such data is either quite difficult or useless to fight because (assuming this service is hosted somewhere outside) any local root admin will be able to read your personal data (yes, I assume that such data is not encrypted on disk...)
Do not take it wrongly: I'm not saying HTTPS for this purpose would be useless. I'm saying that HTTPS alone is not enough and will bring little additional security level.
Again, IMO, best approach is not to enable HTTPS but to avoid asking for useless personal data.
So, why would we like to see HTTPS...? mainly to guaranty we are reaching the right web site, not some fake one. Not easy to have fake "connexelectronic.com" but feasible
Is it worth to spend money buying certificate for this given kind of data this site exposes and collect ? I'm not so sure. And self-signed certificate will not help that much in this case
So again, Cristi, in order to make it easy, just do not ask for anything that is not required and still rely on paypal, this should be ok.
[OT END]
Cheers,
Christian
[OT BEGIN]
I do agree that it's pointless to ask for useless personal information especially because payment is done via Paypal (which is btw an easy and safe enough approach).
Then what will https REALLY bring ?
Tunneling ?
hmmm, yes it could but it's not as secure as you may think. What's the purpose ? avoiding someone one same subnet sniffing your personal data over the network ? Sure it help but it's not "so" safe.
- Is your provider using some proxy able to seat transparently in the middle still accessing "encrypted" data ? (yes, this works
)- is there any reverse proxy on the other side close to this server you try to reach ?
It's something required within companies, I mean on LAN where you don't want other people to retrieve sensitive data (e.g. your personal password) but in our case, I don't think it's the main purpose.
Why ?
Because depending on where this web site is hosted, being on same LAN to sniff such data is either quite difficult or useless to fight because (assuming this service is hosted somewhere outside) any local root admin will be able to read your personal data (yes, I assume that such data is not encrypted on disk...)
Do not take it wrongly: I'm not saying HTTPS for this purpose would be useless. I'm saying that HTTPS alone is not enough and will bring little additional security level.
Again, IMO, best approach is not to enable HTTPS but to avoid asking for useless personal data.
So, why would we like to see HTTPS...? mainly to guaranty we are reaching the right web site, not some fake one. Not easy to have fake "connexelectronic.com" but feasible
Is it worth to spend money buying certificate for this given kind of data this site exposes and collect ? I'm not so sure. And self-signed certificate will not help that much in this case
So again, Cristi, in order to make it easy, just do not ask for anything that is not required and still rely on paypal, this should be ok.
[OT END]
Cheers,
Christian
regarding personal details which i ask, there are required as follows:
First Name:
Last Name:
Date of Birth:
E-mail Address:
Street Address:
Postal Code:
City:
Country:
Telephone Number:
all this informations but the birth date, are needed for the shipping. until recently, paypall did not show the shipping address of the person which made the order (paypal HK) telephone number, as well is not shown. the shipping company requires customer phone number, otherwise they may refuse to send. (don't ask me why, ask them why). who doesn't want to write his birth date can write 01/01/1900 and i will understand the reason.
i didn't use this informations and i'm not willing to use for any other purpose than get in touch with customers in case there is a problem, they not reply at the confirmation email in max 3 days or the name of the customer is not the same as the one who made the payment. i called few customers, and they can confirm the reason for why i called them.
i mention "we do NOT guarantee the security of the hosting server" because i cannot be responsable in case if the company which provide me hosting service made some B&S or somebody hack their server altough i pay for this service, isn't for free.
now i would ask you. what should i do if somebody place and order of $$$ and his name is not the same as the one who made the payment. i send few confirmation emails, without reply, i cannot get his phone number from paypal, only from the site.
i had this situation before and i sent mails both to the person who order and the person who pay and i could not send the ordered products untill both of them confirm. but to get this confirmation i needed that phone number.
now what the birth date has to do with all this ? nothing i would say. i was thinking at a script to make a promotion for the customer which celebrate their birthdate whithin one week after they place the order. but if some of you consider that is not a good ideea i can give-up.
anyway, as i said before, i want to update the site. i found somebody who started doing this and then, he vanish. now i'm looking for somebody else, more serious. otherwise i need to do this also.
about https connection, as Christian mentioned before, it will be as usefull as an umbrella in a middle of a hurricane. anyway money transfer is made on paypal site and they have their own security wich i think is good enough. i think that shifing data on the LAN will be wery hard and non-interesting for potential hackers at the location where i am.
First Name:
Last Name:
Date of Birth:
E-mail Address:
Street Address:
Postal Code:
City:
Country:
Telephone Number:
all this informations but the birth date, are needed for the shipping. until recently, paypall did not show the shipping address of the person which made the order (paypal HK) telephone number, as well is not shown. the shipping company requires customer phone number, otherwise they may refuse to send. (don't ask me why, ask them why). who doesn't want to write his birth date can write 01/01/1900 and i will understand the reason.
i didn't use this informations and i'm not willing to use for any other purpose than get in touch with customers in case there is a problem, they not reply at the confirmation email in max 3 days or the name of the customer is not the same as the one who made the payment. i called few customers, and they can confirm the reason for why i called them.
i mention "we do NOT guarantee the security of the hosting server" because i cannot be responsable in case if the company which provide me hosting service made some B&S or somebody hack their server altough i pay for this service, isn't for free.
now i would ask you. what should i do if somebody place and order of $$$ and his name is not the same as the one who made the payment. i send few confirmation emails, without reply, i cannot get his phone number from paypal, only from the site.
i had this situation before and i sent mails both to the person who order and the person who pay and i could not send the ordered products untill both of them confirm. but to get this confirmation i needed that phone number.
now what the birth date has to do with all this ? nothing i would say. i was thinking at a script to make a promotion for the customer which celebrate their birthdate whithin one week after they place the order. but if some of you consider that is not a good ideea i can give-up.
anyway, as i said before, i want to update the site. i found somebody who started doing this and then, he vanish. now i'm looking for somebody else, more serious. otherwise i need to do this also.
about https connection, as Christian mentioned before, it will be as usefull as an umbrella in a middle of a hurricane. anyway money transfer is made on paypal site and they have their own security wich i think is good enough. i think that shifing data on the LAN will be wery hard and non-interesting for potential hackers at the location where i am.
Well when I order from you I will just send you the information you need to your gmail address and make the money available to the email address linked to your paypal account. Maybe a solution for bobjr as well.
It is not with rude intentions just safety concerns. I hope you understand.
It is not with rude intentions just safety concerns. I hope you understand.
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