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Topics - flester

Pages: [1] 2
1
Amplifier Discussion / Reverse polarity protection
« on: February 07, 2019, 05:08:25 AM »
I neglected to add reverse protection to my LM386 amp and broke. It is basically the Little Gem/Smokey amp.
https://goo.gl/images/3dqb9b
 It powers on but no output. I am checking all the caps and the IC.
Anything else I should check?
What type of diode should I (have) use(ed) for reverse polarity?

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2
Preamps and Effects / Strange pedal issue
« on: November 06, 2018, 09:25:19 AM »
I have a guitar cable with angled plug on one end and straight on the other. My Boss DS1 pedal will only work with the angled one in the pedal and the straight into the guitar. The cable works both ways when it goes directly from guitar to amp.  Is that normal?

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3
Amplifier Discussion / 1x12" cabinet dimensions.
« on: October 28, 2018, 07:05:56 PM »
I have a Celestion G12 P80 12" speaker and some pineboard. A  1X12 cab seems an obvious project. Any opinions on dimensions? I see some commercially available ones include  350x275x350(portable),  550x460x290 (Orange), 433 x 445 x 233 (Fender).
My joinery skills are reasonable

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4
Tubes and Hybrids / Recommended Tube Amp kitd
« on: October 08, 2018, 11:58:42 AM »
Feel like I'm ready to try a tube build from a kit. Any recommendations for a first timer (including "don't do it" or "don't ask here"). I am  thinking something simple on 240 v 50hz mains power.

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5
Amplifier Discussion / Power on LED.
« on: September 12, 2018, 03:53:15 PM »
I added a 'power on' LED to my TDA2003 amp and it is really draining the battery. Not sure if attached schematic is clear but it is between input ground and the + supply pin on the board. It's a green LED rather than the usual green with 2k resistor and 9v battery.

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6
Amplifier Discussion / My projects so far
« on: September 06, 2018, 08:21:51 AM »
Here are my completed amp projects to date, which I have referred to in my other posts. Thanks to everyone here who took the time to read and answer my queries. https://i.imgur.com/up8S0bt.jpg

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7
The Newcomer's Forum / Stripboard woes
« on: August 29, 2018, 11:58:16 AM »
Probably because of my soldering technique, I keep breaking the conductive strips on stripboard. Do I just need to user better quality stripboard, improve my technique  or move on to something new? I find I can assemble something, it works but by the time I add pots, switches etc. and put it in an enclosure I find I've broken the conductors.

8
Amplifier Discussion / Hotone Nano Amp Heads
« on: August 10, 2018, 05:46:15 PM »
Have been looking at small SS amp heads with a view to building 10" cab. The Hotone ones for example.  http://www.hotoneaudio.com/products/nanolegacy/Amplifier1/2016/1114/184.html
Are these any different to a small practice amp without a speaker? Any idea of what electronics they use?

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9
The Newcomer's Forum / Centre Negative DC Jack
« on: July 02, 2018, 09:20:23 AM »
I've been trying to work this out for myself but it's beaten me.

I have a few small amps which can run off a 9v battery, or a wall wart via a DC jack (which disconnects the battery). I want to change the DC jacks to be 'negative centre' so match my pedals so I can run the amp and pedals from the same supply. Any suggestions for wiring this?

10
The Newcomer's Forum / Using 2 Velleman TDA2003 modules
« on: May 04, 2018, 02:47:38 AM »
As mentioned in other posts I have 2 of these. How would I wire both to drive  single speaker? Or 2 speakers maybe?
 http://Https://www.velleman.eu/products/view/?id=9181

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11
The Newcomer's Forum / Orange Crush 12 repair
« on: March 26, 2018, 06:10:15 PM »
Last yr my Orange failed and my local amp guy fixed it by replacing an Opamp chip soldered directly to the board. Now its gone again and I think I can fix it myself Is there any reason not to use an 8 pin socket instead for easy replacement of the chip? Theres only one 8 pin chip that I can see

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12
Tubes and Hybrids / What to do with this old Pye radio?
« on: March 22, 2018, 05:40:24 PM »
Fix up the existing radio, turn in to valve amp, build in an SS radio or an SS amp? Retro iPod dock? Even as a piece of furniture its worth keeping but it needs to produce sound I think.

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13
The Newcomer's Forum / Guitar plus iPod inputs
« on: February 08, 2018, 09:19:34 AM »
If I want to plug in a guitar and iPod at the same time can I just connect the 2 inputs in parallel?

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14
The Newcomer's Forum / Charging questions
« on: January 23, 2018, 07:36:59 PM »
What charging voltage is generally used for batteries of different voltages? for example I'd like to be able to charge a 9v PP3 while a power supply is plugged in ro my LM386 amp. Also my 12V Black and Decker drill needs a new charger as the original one is only giving me 5V when plugged in to the mains whereas it used to be 15V as far as I know. I am charging it now using a 12v power supply.

15
The Newcomer's Forum / Potentiometer materials
« on: January 12, 2018, 07:25:14 AM »
Trying to pick pots for amp projects. Any view on track material i.e. carbon, cermet, conductive plastic etc? Longevity, price, noise etc.? Trying to choose what local vendors can supply me at reasonable cost. Farnell and Radionics both have good delivery costs to Ireland for example.

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