zapnspark said:
Oops!
Thanks for pointing that out.
MJL21193 said:
No, I haven't done the Paypal account thing yet. Will do asap.
I will be very busy with work next week, but I hope to have every thing sorted, with at least some basic measurements of the amplifier up on my web site next weekend.
Cheers,
Glen
It works! - almost first time 🙂
I’ve given up on trying to get both amplifier channels working in the chassis this weekend.
The electronics shop local to me a bloody hopeless, with most of the misc hardware items I require out of stock.
So I just wired one channel up without the chassis, soldered in a 100pF Cdom cap, plugged it in, and turned up the volume.
Other than to set the bias current of the output stage and to measure the DC operating point and rail voltages, I haven’t made a single other measurement on the amp yet and it works and sounds great.
With the source plugged in the amp is absolutely dead quite.
The only hassle I had when I first powered it up is that the DC operating point was all over the place.
This was quickly tracked down to the fact that I soldered D5 in the wrong way round.
With all the pictures of the loaded circuit board I’ve posted here so far I’m a little disappointed that nobody was astute enough to notice 😀
When I get the amp installed into the chassis I will necessarily make some proper open loop gain and phase measurements to see how low I can go with Cdom while still maintaining stability into a capacitive load.
With the 100pF Cdom currently installed the amp is most likely overcompensated. For the initial testing I also wound an excessively large output coupling inductor just to be safe, but the amp seems to be perfectly unfazed running with or with out the load coupling network, into my crappy dusty Sanyo speaker from the shed.
The amp is currently playing some mellow Discharge tunes at full blast.
Cheers,
Glen
I’ve given up on trying to get both amplifier channels working in the chassis this weekend.
The electronics shop local to me a bloody hopeless, with most of the misc hardware items I require out of stock.
So I just wired one channel up without the chassis, soldered in a 100pF Cdom cap, plugged it in, and turned up the volume.
Other than to set the bias current of the output stage and to measure the DC operating point and rail voltages, I haven’t made a single other measurement on the amp yet and it works and sounds great.
With the source plugged in the amp is absolutely dead quite.
The only hassle I had when I first powered it up is that the DC operating point was all over the place.
This was quickly tracked down to the fact that I soldered D5 in the wrong way round.
With all the pictures of the loaded circuit board I’ve posted here so far I’m a little disappointed that nobody was astute enough to notice 😀
When I get the amp installed into the chassis I will necessarily make some proper open loop gain and phase measurements to see how low I can go with Cdom while still maintaining stability into a capacitive load.
With the 100pF Cdom currently installed the amp is most likely overcompensated. For the initial testing I also wound an excessively large output coupling inductor just to be safe, but the amp seems to be perfectly unfazed running with or with out the load coupling network, into my crappy dusty Sanyo speaker from the shed.
The amp is currently playing some mellow Discharge tunes at full blast.
Cheers,
Glen
Attachments
G.Kleinschmidt said:
Speaking of which, what did you pick for R4 ?
As you mentioned Jensen: there's a mint Interceptor convertible in the next village down the road from me.
Such a car still does a collectors value of 75-100 US$k in these parts.
I spent 2-1/2 minutes in a shiny new mark III at my first visit to the Amsterdam car show in '75, time flies when you're heading to the plastic teeth brigade.
jacco vermeulen said:
330 ohms for R4. I also used larger values for R1, R2 and R3.
Schematic will be updated along with a BOM provided in the net webpage update.
Not as valuable as a Jensen, but a lot sexier, IMO – my customised Zed coupe.
Its somewhat modified 280bhp @ ~7000 rpm triple weber (DCOE45) equiped engine suffered crank damage nearly two years ago when the pulley let go somewhere between 7000 and 8000 rpm.
It’s currently sitting in the elements under the skeleton of my shed under construction, with the new engine taking up room in my electronics workshop. 🙁
I'm hanging out for the home renos to stop draining my income so I can get this baby back on the road.
Was a real rocket, at only 1080kg with its Porsche type syncro 5 speed and 4.625:1 diff. 😀
Attachments
OK, after some hassle with Paypal website compatibility bugs with the Windoze 98 version of IE, and having to trawl through that pretty uninformative website of theirs which is painfully slooooowwwww on my dial up internet connection, I have signed up with a "Premier Account".
Apparently two small deposits have been made into my bank account, the amounts of which I will need to confirm in about 5 days to allow me to transfer into my bank account payments made into my PayPal account.
Is that all there is to it?
And what is the general procedure for me getting payed? Do I just use their popup window thing to email people demands for money? 😕 Seems a bit rude.
Cheers,
Glen
Apparently two small deposits have been made into my bank account, the amounts of which I will need to confirm in about 5 days to allow me to transfer into my bank account payments made into my PayPal account.
Is that all there is to it?
And what is the general procedure for me getting payed? Do I just use their popup window thing to email people demands for money? 😕 Seems a bit rude.
Cheers,
Glen
Why not just post the number per board, the mailing cost and the paypal account.
As for me, i have no preference whether it's paypal, bank transfer, cash letter or whatever.
As for me, i have no preference whether it's paypal, bank transfer, cash letter or whatever.
G.Kleinschmidt said:
Hi Glen,
And here I thought you were state of the art! 🙂
Paypal invoice sent out to the buyer. Not rude, just business.
Nice wheels though
MJL21193 said:
Hi Glen,
And here I thought you were state of the art! 🙂
Paypal invoice sent out to the buyer. Not rude, just business.
Nice wheels though
Yeah I know, my home computer is probably a bit overdue for an upgrade 🙂
Anyway, I can start getting these boards sorted now.
As stated previously, I currently have 20 boards, so 18 ready to send out. Due to the hiccup with the manufacturer, the remaining 30 boards are still atleast a week away.
Factoring in 10% GST plus freight, the boards have cost me a grand total of about $8.70 Australian bucks each.
So, the cost will be the number of boards one wants times AUD$8.70 + the cost of a padded envelope + postage.
If all those who have put their names on the list could start by sending me an email with their desired delivery address, I can then work out the individual postage costs and email a formal request for the required total sum through PayPal.
glenk@picknowl.com.au
Cheers,
Glen
to NOS or not to NOS ?
Glen,
I am from the time when "solid state" was "the future" and
tubes were "on the way out" ...
so a couple of "nos" 2N3055 are still in my drawer.
Unfortunately the ECC83 will have be bought "new" 🙂
...all those salvaged radio parts were dumped by my mom... ;-)
:grin:
Intriguing piece of circuit design ! - No 2SK389 will glow nicer!
...you've got mail
Regards
Glen,
I am from the time when "solid state" was "the future" and
tubes were "on the way out" ...
so a couple of "nos" 2N3055 are still in my drawer.
Unfortunately the ECC83 will have be bought "new" 🙂
...all those salvaged radio parts were dumped by my mom... ;-)
:grin:
Intriguing piece of circuit design ! - No 2SK389 will glow nicer!
...you've got mail
Regards
OK guys, just acknowledging that I’ve received your e-mails. Its getting too late here at the moment and I’m going to be a bit busy for the rest of the week, but I will start finding out the postage costs and replying to e-mails tomorrow evening.
Cheers,
Glen
Cheers,
Glen
OK guys, I’m starting to get my act together. I’ve just finished researching the postage costs and will start replying to the received e-mails ASAP. I am very busy with other stuff, so please bear with me.
Today I received the remaining 30 boards (a lot earlier than I expected 🙂 ), along with the printed invoice, and I bought a bunch of padded envelopes.
Unfortunately I under quoted the price of the boards by a small amount, as I incorrectly assumed that the 50 board tally on the quotation I received included the tooling charges, which were listed separately.
The total cost for the 50 boards was AU$496.76
The cost for one board is therefore AU$9.94
The padded envelope is AU$0.90
For international postage I will be using Aust. Posts Express Courier International letter service, which is the cheapest letter service that actually allows tracking (on-line).
This service comes in at a flat rate of AU$11.85
For International PayPal payments, I will have to add 4% to the total cost to account for the 1.5% processing fee and the 2.5% currency conversion fee (all payments to be in Australian dollars).
That’s as cheap as I can do it without returning a loss!
Currently 22 boards have been sold via e-mail order, so there are 26 of the 48 remaining.
Cheers,
Glen
Today I received the remaining 30 boards (a lot earlier than I expected 🙂 ), along with the printed invoice, and I bought a bunch of padded envelopes.
Unfortunately I under quoted the price of the boards by a small amount, as I incorrectly assumed that the 50 board tally on the quotation I received included the tooling charges, which were listed separately.
The total cost for the 50 boards was AU$496.76
The cost for one board is therefore AU$9.94
The padded envelope is AU$0.90
For international postage I will be using Aust. Posts Express Courier International letter service, which is the cheapest letter service that actually allows tracking (on-line).
This service comes in at a flat rate of AU$11.85
For International PayPal payments, I will have to add 4% to the total cost to account for the 1.5% processing fee and the 2.5% currency conversion fee (all payments to be in Australian dollars).
That’s as cheap as I can do it without returning a loss!
Currently 22 boards have been sold via e-mail order, so there are 26 of the 48 remaining.
Cheers,
Glen
Attachments
Nice stack of boards Glen. 🙂
Do you have the final BOM yet? I'm holding off on a Digikey order - I want half watt Vishay/Dale resistors for this.
Sorry for the pressure. 🙂
Do you have the final BOM yet? I'm holding off on a Digikey order - I want half watt Vishay/Dale resistors for this.
Sorry for the pressure. 🙂
Okkayyy.....
I've just finished replying to all emails. Let me know if there are any problems.
Currently 24 boards remaining.
MJ, no BOM yet. It's now 10 minutes to 11pm, I'm going to bed!
Cheers,
Glen
I've just finished replying to all emails. Let me know if there are any problems.
Currently 24 boards remaining.
MJ, no BOM yet. It's now 10 minutes to 11pm, I'm going to bed!
Cheers,
Glen
G.Kleinschmidt said:
Guess nobody is in a real rush here - go take a nap
"lost sleep" may be counted as a "loss" too
Just as a note...
I do not have tubes in any of my drawers so I intend to use:
6N2P-EV
a russian dual triode very suitable for audio use, similar to the 12AX7/ECC83,
compatible except for the filament.
The tube is heated with 6.3V/340mA via pin 4/5,
pin 9 is connected to a screen between the two triodes and must be grounded.
...can any tube-guy please comment on that??? (I don't mind a little pcb modding myself)
Also I found a single "M 114/40 Armco Quality" Transformer:
sec.
2 x 28V/4A,
6,3V/2,5A,
35V/1A
...surplus=cheap...would solve heating nicely - are the overvoltages within reason? 🙄
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