Hi all, I'm toying with the idea of a SATA array HDD power sequencer, to keep the Power-On loads for my PC under control during startup and sudden crash on AC power loss.
Sure, I have a 750W P/S in the box and a 900W UPS in the wall - but they drop and pop the whole-house power 4-5x a day on this compound, and I am not always home, or awake, or able to gracefully shut-down... and I am sick and tired of trashed HDD (3 so far) that I may or may not ever recover, and sick and tired of having to rebuild both PC and my array - hosed files... when that happens.
Ebay offers a 8port latching DC Relay sequencer with programmable delays after startup of the 2d thru 8th ports for ~$20.00 https://www.ebay.com/itm/12V-8ch-Delay-Relay-Module-Latch-Bistable-Self-locking-Interlock-Conditioner/283645126963?_trkparms=aid=111001&algo=REC.SEED&ao=1&asc=20160811114145&meid=5d6b4c353a964cd88de8fe94fc8610a7&pid=100667&rk=5&rkt=8&mehot=none&sd=382485066539&itm=283645126963&pmt=0&noa=1&pg=2334524&brand=Unbranded&_trksid=p2334524.c100667.m2042 but as I have an excess of 40v 10a and 100v 40a MOSFET, I'd like to try doing this without relays.
My idea is to set them up so which once triggered by the CPU 12v Power coming in, would immediately initiate a 30sec delay for the PC HDD to spinup and load the O/S, and then start spinning up the array, each drive 5-15 seconds after one-another.
... I envision a clock on PWR that initiates a delay of 30sec-1min (adj), then it trips another clock that simply counts up to n (programmable via dip switch) whereby it's output pin at that time both resets that counter and kicks off drive1, and repeats through drive 8 - In my case, 8 is all I had space, power and SATA ports for https://www.ebay.com/itm/8-Port-SAT...796560?hash=item595330cd50:g:ajIAAOSwzyxeu4VR
Naturally, once this MOSFET driver circuit reached loop #8 (and hopefully... all drives are ready) it would latch in that condition and only re-start the sequence when the power was turned off, either by loss of power (sigh) or by me tenderly 'parking' my system and the array for the night.
Anyone care to share their Ideas? It would definitely be less power-hungry and noisy than that massive 8-Relay module, but it might NOT be better. I have a well-stocked partsbin - both single and dual 555/556 timer modules, all of the 74 (TTL) and 4000-series CMOS chips (4000-4060), hundreds of NPN and PNP transistors, TRIACS and SCRs, dozens of N and P-Chan MOSFET (I like the N-Chan) resistors, diodes, caps, zeners and lots of perfboard.
.
Sure, I have a 750W P/S in the box and a 900W UPS in the wall - but they drop and pop the whole-house power 4-5x a day on this compound, and I am not always home, or awake, or able to gracefully shut-down... and I am sick and tired of trashed HDD (3 so far) that I may or may not ever recover, and sick and tired of having to rebuild both PC and my array - hosed files... when that happens.
Ebay offers a 8port latching DC Relay sequencer with programmable delays after startup of the 2d thru 8th ports for ~$20.00 https://www.ebay.com/itm/12V-8ch-Delay-Relay-Module-Latch-Bistable-Self-locking-Interlock-Conditioner/283645126963?_trkparms=aid=111001&algo=REC.SEED&ao=1&asc=20160811114145&meid=5d6b4c353a964cd88de8fe94fc8610a7&pid=100667&rk=5&rkt=8&mehot=none&sd=382485066539&itm=283645126963&pmt=0&noa=1&pg=2334524&brand=Unbranded&_trksid=p2334524.c100667.m2042 but as I have an excess of 40v 10a and 100v 40a MOSFET, I'd like to try doing this without relays.
My idea is to set them up so which once triggered by the CPU 12v Power coming in, would immediately initiate a 30sec delay for the PC HDD to spinup and load the O/S, and then start spinning up the array, each drive 5-15 seconds after one-another.
... I envision a clock on PWR that initiates a delay of 30sec-1min (adj), then it trips another clock that simply counts up to n (programmable via dip switch) whereby it's output pin at that time both resets that counter and kicks off drive1, and repeats through drive 8 - In my case, 8 is all I had space, power and SATA ports for https://www.ebay.com/itm/8-Port-SAT...796560?hash=item595330cd50:g:ajIAAOSwzyxeu4VR
Naturally, once this MOSFET driver circuit reached loop #8 (and hopefully... all drives are ready) it would latch in that condition and only re-start the sequence when the power was turned off, either by loss of power (sigh) or by me tenderly 'parking' my system and the array for the night.
Anyone care to share their Ideas? It would definitely be less power-hungry and noisy than that massive 8-Relay module, but it might NOT be better. I have a well-stocked partsbin - both single and dual 555/556 timer modules, all of the 74 (TTL) and 4000-series CMOS chips (4000-4060), hundreds of NPN and PNP transistors, TRIACS and SCRs, dozens of N and P-Chan MOSFET (I like the N-Chan) resistors, diodes, caps, zeners and lots of perfboard.
.