Menu

Show posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Show posts Menu

Messages - flester

#136
The Newcomer's Forum / Re: First real build. LM386.
January 31, 2018, 10:12:02 AM
Quote from: Katoda on January 31, 2018, 09:26:57 AM


A jack like this one, but a mono version. Or stereo, doesn't matter. Plastic 6.3 mm jack
What is it called?

Sent from my SM-G935F using Tapatalk

#137
The Newcomer's Forum / Re: First real build. LM386.
January 31, 2018, 07:28:17 AM
Thinking about the speaker, I want to use a combo as a cab. Very useful for testing all kinds of amp projects. What type of jack will disconnect the internal amp when an input is plugged in. Been searching 'switched jack' but that doesnt seem to cover what I want.

Sent from my SM-G935F using Tapatalk

#138
The Newcomer's Forum / Re: Charging questions
January 24, 2018, 04:40:32 AM
Quote from: Katoda on January 24, 2018, 04:31:11 AM
AFAIK most chargers supply pulses at a certain frequency, varying the amount of current and voltage that goes into the battery in relation to the charge. Connecting a battery straight to DC might damage it. If you do decide to put a charger inside an amp, be wary of possible EMI issues, as the pulsating high current will probably radiate a lot of interference.
OK will watch for that. I did take my drill charger apart and it seemed to just have a transformer, some resistors and diodes i.e. its basically a rectifier but who knows what circuitry is in the drill itself.  The 12v supply did charge the drill but might get an aftermarket charger for it. And will stay away from chargeable amps for now

Sent from my SM-G935F using Tapatalk

#139
The Newcomer's Forum / Charging questions
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.
#140
The Newcomer's Forum / Re: First real build. LM386.
January 23, 2018, 06:24:42 AM
Quote from: flester on January 16, 2018, 02:10:25 PM
Quote from: phatt on January 12, 2018, 08:14:07 AM
Hey some nice blues riff there :tu:
BTW, looks like you are driving a hifi type speaker box,, if so then be aware they are woofers and generally have a low SPL,, a real guitar speaker will give a much bigger sound,, louder per watt of input.
Phil.
A friend has a 12" guitar speaker I can use. Time for a bit of joinery I think


Sent from my SM-G935F using Tapatalk
Works as a harmonica amp too. I made the mic using a headphone speaker. The black box on the right contains a Kemo preamp module, needed to overdrive the amp. A Danelectro overdrive pedal works too. https://flic.kr/p/22mhiVv

Sent from my SM-G935F using Tapatalk

#141
The Newcomer's Forum / Re: First real build. LM386.
January 16, 2018, 02:10:25 PM
Quote from: phatt on January 12, 2018, 08:14:07 AM
Hey some nice blues riff there :tu:
BTW, looks like you are driving a hifi type speaker box,, if so then be aware they are woofers and generally have a low SPL,, a real guitar speaker will give a much bigger sound,, louder per watt of input.
Phil.
A friend has a 12" guitar speaker I can use. Time for a bit of joinery I think


Sent from my SM-G935F using Tapatalk

#142
The Newcomer's Forum / Re: Potentiometer materials
January 16, 2018, 02:06:40 PM
Quote from: phatt on January 12, 2018, 09:58:09 PM

Awe shucks Enzo,,you talkin bout me again?  :lmao:
My problem is that a store that used to stock all the small Alpha pots went broke and now I have to use what ever I can get.
One day I'll have to bite the bullet and buy online I guess.

@ Flester; When you say they fell apart,, I hope you are aware those pot lugs are rather delicate so don't stress them too much and don't apply heat for too long when soldering.
I've used cheap alpha pots for years and some last longer than others.
Phil.
Didnt physically break but would not conduct.
I may have overheated one but the others were never soldered and still did not work. It is harder to get good materials for making anything these days. My Dad used to make or fix anything and still does but its becoming harder.

Sent from my SM-G935F using Tapatalk

#143
The Newcomer's Forum / Re: Potentiometer materials
January 16, 2018, 01:14:23 PM
Thanks all. Farnell seems a good  supplier with free delivery to Ireland as long as you dont pick something from their US warehouse then its €20 delivery. (nearly got caught with that). Just ordering from them so will keep u posted. Theres also Radionics and both of the above supply the industrial market. Theres also a Maplin store locally with high prices.

Sent from my SM-G935F using Tapatalk

#144
The Newcomer's Forum / Re: Potentiometer materials
January 12, 2018, 12:13:56 PM
Not a question of Mojo. Just when I ordered some generic 1k carbon pots from Amazon they were particularly bad and fell apart when soldered. And there is a huge choice so hoping to get something usable. How about wirewound ones? They look a bit  bulky for my current project though.

Sent from my SM-G935F using Tapatalk

#145
The Newcomer's Forum / Potentiometer materials
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.

Sent from my SM-G935F using Tapatalk

#146
The Newcomer's Forum / Re: First real build. LM386.
January 11, 2018, 03:27:12 PM
Quote from: flester on January 03, 2018, 04:32:52 PM
Quote from: Katoda on January 02, 2018, 08:37:37 AM
Oh right, sorry, I wasn't looking at the schematic, didn't see that the gain control was actually feedback control. For that configuration you might need an anti-log pot. Also, datasheet specifies you should use a capacitor in series with the pot, but that's not really the problem.
For the pots - I usually use Alpha brand, they're cheap and of all-right quality.

Sorry I couldn't be of more help, good luck.
Today i added a DC jack to use a 12v supply or the 9v battery. 12v fattens and cleans up the sound nicely at minimum gain. Also  screwed the board in place and used hot glue here and there so nothing moves that shouldnt.

Im guessing any 1k pot would be an improvement but will try antilog and also linear.

Now planning MkII. Will post final schematic and sound samples in due course


Sent from my SM-G935F using Tapatalk
Heres a video with my lap steel
https://flic.kr/p/23otDrP

Sent from my SM-G935F using Tapatalk

#147
Preamps and Effects / Re: Active pickupa
January 07, 2018, 03:44:45 PM
Quote from: tonyharker on January 07, 2018, 12:40:41 PM
Is this an EMG 81? If so you need the connection board as shown here: http://www.emgpickups.com/guitar/humbucking/active-humbucking/81.html .  Have you got it?
Whoa! I thought i had fixed my spelling. Anyway, dont have the board. Will look around the EMG site. The local junk shop just had a box of these with several sets jumbled up so some key parts are missing. I  thought these might be useful for my DIY lap steel as it needs a bridge pickup. https://flic.kr/p/eh33nk. It doesnt sound as good through my LM386 amp as my Hofner Shorty which has a humbucker in it.

Sent from my SM-G935F using Tapatalk

#148
Preamps and Effects / Re: Active pickupa
January 07, 2018, 12:04:36 PM


Quote from: flester on January 07, 2018, 11:56:10 AM
This does have  preamp so it is on topic. I got 2 of these EMG active humbuckers in a box with assorted wiring and pots. Link to photo below. I do get low level sound but the battery has no effect. Any ideas? Of course there may be good reason why they were on sale in a junk shop.

Presume it needs 9v, 0v and Signal.

https://1drv.ms/i/s!Ahfhrrb-UXCajEoaFyNj07ttW7bv

Sent from my SM-G935F using Tapatalk



Sent from my SM-G935F using Tapatalk

#149
Preamps and Effects / Active pickupa
January 07, 2018, 11:56:10 AM
This doea have  preamp so it ia om topic. I got 2 of these in a box with assorted wirong and pots. I do get low level sound but the battery has no effect. Any ideas?

Presume it needs 9v, 0v and Signal.

https://1drv.ms/i/s!Ahfhrrb-UXCajEoaFyNj07ttW7bv

Sent from my SM-G935F using Tapatalk

#150
The Newcomer's Forum / Re: First real build. LM386.
January 03, 2018, 04:32:52 PM
Quote from: Katoda on January 02, 2018, 08:37:37 AM
Oh right, sorry, I wasn't looking at the schematic, didn't see that the gain control was actually feedback control. For that configuration you might need an anti-log pot. Also, datasheet specifies you should use a capacitor in series with the pot, but that's not really the problem.
For the pots - I usually use Alpha brand, they're cheap and of all-right quality.

Sorry I couldn't be of more help, good luck.
Today i added a DC jack to use a 12v supply or the 9v battery. 12v fattens and cleans up the sound nicely at minimum gain. Also  screwed the board in place and used hot glue here and there so nothing moves that shouldnt.

Im guessing any 1k pot would be an improvement but will try antilog and also linear.

Now planning MkII. Will post final schematic and sound samples in due course


Sent from my SM-G935F using Tapatalk