BillFitzmaurice.info

I'd add a suggestion, fasten the board you are routing the hole through down to a sacrificial base via some screws through the piece that will be discarded, by doing that when the router breaks through it won't damage the edge of the hole you made.

Also check out https://neurochrome.com/

Tom is a very talented engineer, I have an occasional beer with him.

If you are up for it take a look at Randy Sloan's designs, unfortunately he died many years ago but his designs are excellent. I'd recommend both his books which include circuits for protection etc. https://www.amazon.com/High-Power-Audio-Amplifier-Construction-Manual/dp/0071341196 and https://www.a...

How about something like this https://www.amazon.ca/TZOXTLH-Sequence-Adjustable-Sequential-Controller/dp/B0GLY9V26D/ref=sr_1_3?crid=1SQCYEIUDBZY1&dib=eyJ2IjoiMSJ9.rvylCLfRmJj4q9Xf9Ijnqo3-gb19uGuQEt8N1TpS2XhOrj3bO1vkfPE92i4MUic-njwpCbx-x2lLvpse9_jwzeAAWTJyW9idmKxIIFSxmJU.EqDjhXjFYcin1JSHeRnQFelY0...

Bills horn sub designs integrate adaptationally well with dipolar speakers. I run 4 xorner placed THT units with Linkwitz lx 521.4 mains, superb, music nirvana.

Bill Fitzmaurice wrote: ↑Tue Nov 18, 2025 7:00 am

Old Mike wrote: ↑Mon Nov 17, 2025 11:19 pm Will the design be available to us DIY people?

That's up to the manufacturer.

Understood

Mike

You got my attention with that post Bill.

Will the design be available to us DIY people?

Seth consider using a bactericide treatment on your fuel tanks. Growths can and do occur at a hydrocarbon/water interface, especially in warmer climates, and can plug filters incredibly quickly.

Seth, As a very long in the tooth retired engineer, (and I think you're probably there already regards this recommendation), when a "transport device" comes with spares the reason is usually due to frequent prior failures. I'd strongly suggest you replenish the parts you have used from th...

So, a little update on my adventures... 53' boat procured. I just completed the first journey, 250 miles up the West Coast of California. From Morro Bay, under the Golden Gate Bridge, into San Francisco Bay, and up the Sacramento River into the San Joaquin Delta where I currently live. 2 days and 9...

Yeah, my sister in-laws in-line hot water heating pump in Lemans France in 1988, probably a 1950/60 installation, it wasn't working so i asked her if she had a hammer she produced what I would call a "toffee hammer", tiny little thing probably all of four ounces, I gave the pump a rap and...

Yeah, my sister in-laws in-line hot water heating pump in Lemans France in 1988, probably a 1950/60 installation, it wasn't working so i asked her if she had a hammer she produced what I would call a "toffee hammer", tiny little thing probably all of four ounces, I gave the pump a rap and ...

Bill
Your after sales support is exemplary, you truly do support your product. Many companies/people don't come close to the dedication you demonstrate. I thank the gods for the day I found your site. Thank you.

Your passion to sail around the world reminds me of an expatriate New Zealander I met in Northern Alberta. He was building a 40 foot ferro-cement sail boat in his backyard. He eventually had the boat lifted out of his backyard and onto a trailer to move it to Vancouver for final fit out. Last I hear...

The last 9 years have flown by for me, I built 4 THT's for my home theater in 2015, see https://billfitzmaurice.info/forum/viewtopic.php?t=23085 I never reported on their performance before, so belatedly here it is. One word "gobsmacking". I ended up having an ischemic stroke in 2019 that ...