I believe I've seen protection circuits with the IC's you mentioned.
The TA7317 has had a long run in many amplifiers and has a good track record. It is still available from MCM and other dealers at a low price usually around $2 a pop.
The partial schematic I put up is from a ALtec 9442 power amplifier. The only weakness being the timing cap, resistor, and diode shown in yellow. When a higher voltage cap is used it will extend the life of the circuit.
It would be nice to generate interest in a protection board. I currently use a Velleman 4700 to protect my speakers when I use a chip amp,tube amp, or any amplifier without a protection circuit.
Its cheap protection against frying a driver. While the 4700 can be had for less than $40 without shipping it might be nice to have a cheaper diy project that can be put together for less than 1/2 of the cost of a 4700 kit.
The TA7317 has had a long run in many amplifiers and has a good track record. It is still available from MCM and other dealers at a low price usually around $2 a pop.
The partial schematic I put up is from a ALtec 9442 power amplifier. The only weakness being the timing cap, resistor, and diode shown in yellow. When a higher voltage cap is used it will extend the life of the circuit.
It would be nice to generate interest in a protection board. I currently use a Velleman 4700 to protect my speakers when I use a chip amp,tube amp, or any amplifier without a protection circuit.
Its cheap protection against frying a driver. While the 4700 can be had for less than $40 without shipping it might be nice to have a cheaper diy project that can be put together for less than 1/2 of the cost of a 4700 kit.
The HA1202 is a common protection IC in amplifiers like TOA and many others. Unfortunately they do show a cross to a ECG1041 which crosses to a NTE part number that is shown to be a FM IF AMP clearly not a good cross.
The UPC 1237 crosses to a NTE7100.
Surely money could be saved by looking at the TA7317 part over the NTE part. Just my opinion..
The HA12002 crosses to a NTE1635 and this is a good number.
Hi, this schematic is published...
...in the webstore www.diyclub.biz
I hope that will do the job. I'm also interested in such a protection board as this could be a great addition to my 2 beloved amplifiers, but I don't have the experience nor the knowledge to give it a try. If you end up to a schematic with a PCB draw, I'll be very interested in. I think there is no need to be for the uPC1237;I think all those IC's (HA12002, TA7317, uPC1237 etc.) have the same characteristics and pin layout.
Regards,
Thanasis.
...in the webstore www.diyclub.biz
I hope that will do the job. I'm also interested in such a protection board as this could be a great addition to my 2 beloved amplifiers, but I don't have the experience nor the knowledge to give it a try. If you end up to a schematic with a PCB draw, I'll be very interested in. I think there is no need to be for the uPC1237;I think all those IC's (HA12002, TA7317, uPC1237 etc.) have the same characteristics and pin layout.Regards,
Thanasis.
Attachments
Re: Hi, this schematic is published...
Unfortunately, none of them have the same pinout. The TA7317 is a 9 pin versus 8 for the other two. The advantage of the TA7317 is it has two inputs, whereas the other two have one input. On these you can sum two channels through input resistors. I like the upc1237 because it is widely available. Like the HA12002, the output can be latched off when it trips.
As far as relays go, there is an article in AudioXpress in the August 1992 edition. Does anybody have a copy?
msamkl said:...I think all those IC's (HA12002, TA7317, uPC1237 etc.) have the same characteristics and pin layout.
Regards,
Thanasis.
Unfortunately, none of them have the same pinout. The TA7317 is a 9 pin versus 8 for the other two. The advantage of the TA7317 is it has two inputs, whereas the other two have one input. On these you can sum two channels through input resistors. I like the upc1237 because it is widely available. Like the HA12002, the output can be latched off when it trips.
As far as relays go, there is an article in AudioXpress in the August 1992 edition. Does anybody have a copy?
d3imlay is correct. The pin out is different in all three chips.
Is it important to be able to latch off the output if the relay trips? I've never come across that in a unit yet. That pin was always tied to ground to allow an automatic reset when conditions changed.
Personally I like the two individual input of the TA7317 IC.
A protection board...
...based on TA7317. The schematic is from http://www.resonator-electronics.hu
http://rapidshare.com/files/79222782/speakprot.pdf.html
Can someone design a PCB from this?
...based on TA7317. The schematic is from http://www.resonator-electronics.hu
http://rapidshare.com/files/79222782/speakprot.pdf.html
Can someone design a PCB from this?
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.