Search found 263 matches
- 29 Mar 2021, 17:54
- Forum: Amplifiers
- Topic: schematic requiest BEL 1001 poweramp
- Replies: 2
- Views: 1070
Re: schematic requiest BEL 1001 poweramp
if it's not in the web,you can only get it from the factory. Anyway ,it's not that complex of an amp,judging by photos,generally speaking transistor power amps consist of 3 main topologies,once you figure out the design it's easy to understand what is working and what's not,and the schematic is almo...
- 06 Oct 2020, 18:56
- Forum: Pedal Debugging & Troubleshooting Support
- Topic: Lm13700 Small Stone depth mod
- Replies: 13
- Views: 3225
Re: Lm13700 Small Stone depth mod"
depth of what,which parameter,did you see it previously done?
- 30 Sep 2020, 17:44
- Forum: Pedal Debugging & Troubleshooting Support
- Topic: Ibanez WH10 calibration issue
- Replies: 5
- Views: 1212
Re: Ibanez WH10 calibration issue
Dbs are just a relationship between values, when measuring guitar circuits you use 100mV in input,in this case you should get 1V at output
- 30 Sep 2020, 15:48
- Forum: Pedal Debugging & Troubleshooting Support
- Topic: Ibanez WH10 calibration issue
- Replies: 5
- Views: 1212
Re: Ibanez WH10 calibration issue
you can't get 7,7 Vrms out of a 9V pedal,that's why you see a clipped signal. Your guitar can be anything up to 1V peak on the attack of the note,the average signal is obviuosly less than that. Opamp circuits output 6/7 volts peak to peak,unless you use special high quality chips Transistor buffers ...
- 09 Aug 2020, 09:54
- Forum: Amplifiers
- Topic: Amp switching
- Replies: 6
- Views: 1584
Re: Amp switching
i tell you this,i am restoring an old Binson hifi 60w,mid 60s amp,original tubes and caps,600V on plates and 390 on screens.
The one and only switch in this is a plastic case 1P1T,with copper tabs,so just one pole switching the main transformer on.
It works perfect like this,all these years.
The one and only switch in this is a plastic case 1P1T,with copper tabs,so just one pole switching the main transformer on.
It works perfect like this,all these years.
- 31 Jul 2020, 05:32
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: EH pulsar tremolo,why 78l09?
- Replies: 10
- Views: 2783
EH pulsar tremolo,why 78l09?
I got this big box 3 knobs pulsar tremolo,on the box it's written 9vdc 100mA,ok, fine,but inside there was a 78l09 regulator between the DC Jack and the circuit,where also the 9v battery connects. Does it mean that EH power supplies were supposed to be 12v,or maybe 10 unregulated? Because it's clear...
- 17 Jul 2020, 14:49
- Forum: DIY Projects
- Topic: BAJA Sagittarian Charger (mini KLON) [documentation]
- Replies: 515
- Views: 133340
Re: BAJA Sagittarian Charger (mini KLON) [documentation]
germanium diodes doesn't matter how you put them once they are in antiparallel,same for 390n and 1k,no matter the position. you can debate on the positive signs of the zener and 4001,but i did this circuit long time ago,correct at first try,same for the pots,i don't have the original documents but i...
- 15 Jul 2020, 07:05
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: MXR - Custom Audio Electronics - Boost/Overdrive MC-402 [schematic]
- Replies: 49
- Views: 36621
Re: MXR - Custom Audio Electronics - Boost/Overdrive MC-402 [schematic]
Isn't r3 value 470k?
- 11 Jul 2020, 18:13
- Forum: Pedal Debugging & Troubleshooting Support
- Topic: Rangemaster weird voltages
- Replies: 4
- Views: 1323
Re: Rangemaster weird voltages
it looks inverted polarity
- 30 Jun 2020, 05:33
- Forum: Boutique Stompboxes dissected...
- Topic: Xotic - AC Booster [ goop-alarm ] [traced]
- Replies: 129
- Views: 56528
Re: Xotic - AC Booster [ goop-alarm ] [traced]
Typical soldering jockey mojo,like that 470 ohm cc resistor on output
- 21 Jun 2020, 09:33
- Forum: Amplifiers
- Topic: How to improve tube amplifier tone by changing one part
- Replies: 101
- Views: 29899
Re: How to improve tube amplifier tone by changing one part
if the sound changes with a perfectly clean signal through 2 specific different capacitors,then you have distortion,on one or both.
which should be measurable to a degree,especially with a 2 tone IMD test.
which should be measurable to a degree,especially with a 2 tone IMD test.
- 02 May 2020, 11:06
- Forum: Pimp-My-Cheap-Pedal
- Topic: Mosky Brown, a Pinnacle II clone
- Replies: 10
- Views: 6461
Re: Mosky Brown, a Pinnacle II clone
i'll tell you this,all those differences are just minor and those which count are basically in the biasing of the jfets,which was really specific in Wampler's case,he had them tested for the specific circuit and nobody knows the exact specs,plus he went through different layouts too,that makes a hig...
- 28 Apr 2020, 19:55
- Forum: Pedal Debugging & Troubleshooting Support
- Topic: Broken Dunlop 95Q... SMD help!
- Replies: 12
- Views: 2461
Re: Broken Dunlop 95Q... SMD help!
yes,there is a low temperature solder that helps,quick something.... or you can try carefully cut the legs of the chip and then remove the rest with the iron. or using one of those 100w "gun" irons,remove the original tip,and replace it with a copper wire shaped rectangular,the long sides ...
- 25 Apr 2020, 08:48
- Forum: Pedal Debugging & Troubleshooting Support
- Topic: Bench charge for pedal SMD repair??
- Replies: 4
- Views: 1629
Re: Bench charge for pedal SMD repair??
Thanks for the tip. I'll take a second look. The opamps looked in tact but maybe I missed it. I've read that reverse polarity usually takes out a diode or two near the power jack but they look fine. I do this as a hobby now (retired) so I won't charge much (maybe 12 pack of beer or toilet paper) if...
- 05 Mar 2020, 07:04
- Forum: Software Room
- Topic: Gaussmarkov Eagle and LTspice tutorials
- Replies: 6
- Views: 5358
Re: Gaussmarkov Eagle and LTspice tutorials
I could see some with way back machine
- 09 Jan 2020, 18:44
- Forum: Amplifiers
- Topic: Madamp M15MK1 build help....
- Replies: 34
- Views: 10712
Re: Amp build help....
insert the cap between the input jack tip and the joint of 1M and the 33k resistors
- 08 Jan 2020, 17:03
- Forum: Amplifiers
- Topic: Madamp M15MK1 build help....
- Replies: 34
- Views: 10712
Re: Amp build help....
i checked your schematic,and yes,its 123 to 133V on the first stages,that calls for dc leakage...
- 08 Jan 2020, 16:40
- Forum: Amplifiers
- Topic: Madamp M15MK1 build help....
- Replies: 34
- Views: 10712
Re: Amp build help....
Bumping my own thread! I managed to fix this amp eventually; after much checking and head scratching I could find no defective components or bad/incorrect connections. I negotiated a credit for another output transformer from the supplier. The amp now produces a rich and complex sound! One minor cr...
- 20 Dec 2019, 19:20
- Forum: Boutique Stompboxes dissected...
- Topic: Hermida Audio - Mosferato M2 (2004)
- Replies: 5
- Views: 1798
Re: Hermida Audio - Mosferato M2 (2004)
every time a solder jockey goops his clipping diodes,a honest engineer dies somewhere.
- 20 Dec 2019, 15:03
- Forum: Boutique Stompboxes dissected...
- Topic: Hermida Audio - Mosferato M2 (2004)
- Replies: 5
- Views: 1798
Re: Hermida Audio - Mosferato M2 (2004)
In the next James Bond movie he will try to catch the secret hidden underneath that goop,Her Majesty wants to know!
Happy Gooped Holydays!
Happy Gooped Holydays!