Hi guys.
Just working on a preamp I am building and I blew two OPA4134s (ouch) because the power supply dumped +-30V onto the power rails. The rectified DC reaches +-50V. I need +-15V. I do not have another transformer so I am in need of some help. This problem needs to be overcome today and I have very limited resources.
The datasheet for the LM337 says 'input to output differential voltage = 40V' and since the differential I was asking of the device was 35V, I assumed this would be OK. In hindsight I do not think my assumptions were correct lol. Is it possible, with two devices in series, I can step down the voltage once, and then once again? My idea is to use a resistor divider network to put the ground potential of the first pair of devices to like 20V, so the regulator itself only sees a max potential difference of 30V anywhere. I could then knock off say 20V with these devices. Then the second pair of devices with the normal ground potential (0V) to regulate the lower voltage down to +-15V.
I know having a lower voltage xformer would fix this straight away but I simply do not have one. I also only have two LM317s and two LM337s left, I cannot afford to blow these.
Any help is greatly appreciated.
Dan
Just working on a preamp I am building and I blew two OPA4134s (ouch) because the power supply dumped +-30V onto the power rails. The rectified DC reaches +-50V. I need +-15V. I do not have another transformer so I am in need of some help. This problem needs to be overcome today and I have very limited resources.
The datasheet for the LM337 says 'input to output differential voltage = 40V' and since the differential I was asking of the device was 35V, I assumed this would be OK. In hindsight I do not think my assumptions were correct lol. Is it possible, with two devices in series, I can step down the voltage once, and then once again? My idea is to use a resistor divider network to put the ground potential of the first pair of devices to like 20V, so the regulator itself only sees a max potential difference of 30V anywhere. I could then knock off say 20V with these devices. Then the second pair of devices with the normal ground potential (0V) to regulate the lower voltage down to +-15V.
I know having a lower voltage xformer would fix this straight away but I simply do not have one. I also only have two LM317s and two LM337s left, I cannot afford to blow these.
Any help is greatly appreciated.
Dan