Roland - AF-60 BeeGee Fuzz Sustainer [schematic]
Not sure what year this booger came from, but here ya go, my precious Bee Gee laid bare. Always thought the Toshiba silver hat IC was pretty cool.
- Attachments
- Bernardduur
- Transistor Tuner
'No more....... loud music.......'
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
- analogguru
- Old Solderhand
Information
The resistor from the volume pot to gnd isn´t 47 Ohm, it is 470 Ohm. And one capacitor 10µF from V+ to ground isn´t drawn in the schematic.
BTW, the "beautiful TA7504M" has been "cannibalized" by the guys at Roland. Normally this chip has 8 pins. in the factory they cut two legs (pin 1 and 5) for easier assembly - have a look at the underside of the chip. From the chip architecture it is very similar (and compatible) to a 741.
analogguru
BTW, the "beautiful TA7504M" has been "cannibalized" by the guys at Roland. Normally this chip has 8 pins. in the factory they cut two legs (pin 1 and 5) for easier assembly - have a look at the underside of the chip. From the chip architecture it is very similar (and compatible) to a 741.
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- gnognofasciani
- Solder Soldier
Great pics, thank you!
Search button is your friend
I personally dig the sound a lot. I think it gets overlooked frequently in favor of the Double Beat and Bee Baa.Bernardduur wrote:How's the sound? Are those silicon diodes?
Not sure if the diodes are silicon or germanium.
- analogguru
- Old Solderhand
Information
They are silicon.Not sure if the diodes are silicon or germanium.
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
Makes sense as virtually everything that came out of Japan by that point was silicon-based. Question, AG: Would swapping out the silicons for germaniums require any tuning to the rest of the circuit or would it be a straight affair?
- analogguru
- Old Solderhand
Information
Sickle wrote:Makes sense as virtually everything that came out of Japan by that point was silicon-based. Question, AG: Would swapping out the silicons for germaniums require any tuning to the rest of the circuit or would it be a straight affair?
Better if you mod an Colorsound Tonebender reissue - similar circuit.
But if you really want to change the diodes then I would change the output capacitor from 47n to 100n and shorten the 47k between the cap and the volume poti. This will give you nearly the same max. output level. The reason is that germanium diodes will have less signal.
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- yeeshkul
- Breadboard Brother
Hello analogguru, i can see a 10uF cap to the ground via 15k and 470k resistor - did you overlooked this one or you mean another 10uF filtering cap?analogguru wrote:And one capacitor 10µF from V+ to ground isn´t drawn in the schematic. analogguru
also ... guys does anyone have a datasheet for TA7504M please?
- modman
- a d m i n
Information
- Posts: 4890
- Joined: 19 Jun 2007, 16:57
- Has thanked: 4394 times
- Been thanked: 2131 times
more gutshots
- Attachments
-
- Studio1525-1-6-2014-026_3.jpg (23.05 KiB) Viewed 8043 times
-
- Studio1525-1-6-2014-026_4.jpg (45.2 KiB) Viewed 8043 times
-
- Studio1525-1-6-2014-026_5.jpg (62.23 KiB) Viewed 8043 times
-
- Studio1525-1-6-2014-026_6.jpg (35.36 KiB) Viewed 8043 times
-
- Studio1525-1-6-2014-026_7.jpg (53.69 KiB) Viewed 8043 times
-
- Studio1525-08-14-2018-009_6.JPG (45.87 KiB) Viewed 8043 times
-
- Studio1525-08-14-2018-009_7.JPG (54.03 KiB) Viewed 8043 times
-
- Studio1525-08-14-2018-009_2.JPG (62.37 KiB) Viewed 8043 times
-
- Studio1525-08-14-2018-009_5.JPG (32.65 KiB) Viewed 8043 times
-
- Studio1525-08-14-2018-009.JPG (43.09 KiB) Viewed 8043 times
Please, support freestompboxes.org on Patreon for just 1 pcb per year! Or donate directly through PayPal