Pearl - F-605 (Analog Delay)  [schematic]

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Re: Pearl - F-605 (Analog Delay)

Postby DiscoFreq » 11 Jul 2008, 10:57

It's still the only one of the F-60x series I don't have:

Vorg F-501 Phase Shifter
Pearl F-601 Phase Shifter
Pearl F-602 Warp Sound
Pearl F-603 Graphic Equalizer
2x Pearl F-604 Flanger Analog Delay Effect

I tried to swap one of the flangers for a delay a few times, but didn't succeed yet ;)

Dirk_Hendrik wrote:The fact that you're working on a Pearl Unit of the F60x series suggests you're in Europe

You think they were only sold in Europe?
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Re: Pearl - F-605 (Analog Delay)

Postby Dirk_Hendrik » 11 Jul 2008, 13:55

Very strong guess since I've never seen em anywhere else in the world.
Sorry. Plain out of planes.

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Re: Pearl - F-605 (Analog Delay)

Postby DiscoFreq » 11 Jul 2008, 14:03

Dirk_Hendrik wrote:Very strong guess since I've never seen em anywhere else in the world.

I don't think I ever thought about that with this series, but you're right, I never saw them anywhere else (any exceptions could have been bought on eBay)...

It's like with some of those MIJ OEM brands: Sanox (FR,BE?), Avora (NL?), Redson (FR?),...
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Re: Pearl - F-605 (Analog Delay)

Postby Bernardduur » 11 Jul 2008, 16:34

No schematic????

Else I'll give it a try :D
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Re: Pearl - F-605 (Analog Delay)

Postby Dirk_Hendrik » 11 Jul 2008, 18:09

Please do, I never found the pactience.. I will check it for you though.... most likely followed by some justified :hmmm: :hmmm: 's from herr Divos.
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Re: Pearl - F-605 (Analog Delay)

Postby Bernardduur » 11 Jul 2008, 18:14

OK; dunno when I have some spare time but it'll work!
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Re: Pearl - F-605 (Analog Delay)

Postby analogguru » 11 Jul 2008, 18:25

:hmmm: :hmmm: :hmmm: :hmmm:
Maybe I should sell mine ?

:hmmm: :hmmm: :hmmm: :hmmm:
Anyway, here is a picture of the solder side if somebody has a use for it.

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Re: Pearl - F-605 (Analog Delay)

Postby Bernardduur » 14 Jul 2008, 15:33

Hmmmm, so here's a first try for the schematic

Linkie

V is -15V or -12V depending on the PSU
All IC's (dual opamps) are grounded at pin 8 and are fed -15V at pin 4

SW1, input selection:
1 = -20 dB
2 = -35 dB
3 = -50 dB

Sw2, output selector:
1 = delay only
2 = -20 dB
3 = -35 dB

SW3, Effect:
1 = delay
2 = Chorus
3 = Duplex
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Re: Pearl - F-605 (Analog Delay)

Postby Dirk_Hendrik » 15 Jul 2008, 07:43

Great work so far Rogier! (vankantie zeker?)

Just after a quick scan:
- is that 4k7 => 1uF network from base to collector on the input resistor really there like that?
- recheck the BBD output. It should have a resistor to ground. That 10uF cap canot be there like that.
- I wonder how the input signal flows to the BBD. Definitely not trough that 100 k resistor connected to the inverting input of U1a. There should be something like a mixer stage there mixing input and feedback together.

But nevertheless, you did a lot of work and it's a bitchy PCB. I should find the time to verify.
Sorry. Plain out of planes.

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Re: Pearl - F-605 (Analog Delay)

Postby Bernardduur » 15 Jul 2008, 10:41

Vierdaagse he :)

I've checked the notes and corrected em on the schematic; she's real hard to work with so I'll check my trace later for more mistakes :)
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Re: Pearl - F-605 (Analog Delay)

Postby lohstah » 15 Jul 2008, 11:29

hey bernarddur,

could you look at the pics on the first page of this thread and check for those two wires that i asked about (near the mn3005) ? i still have one thing that bothers me with this unit: when i change the setting to chorus and choose short delay times, i get a considerable amount of distortion. but in delay setting, even with the short felay times, there is no distortion.

cheers,
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Re: Pearl - F-605 (Analog Delay)

Postby lohstah » 15 Jul 2008, 11:51

here´s a pic with yellow arrows indicating the two wire stubbles:
Image
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Re: Pearl - F-605 (Analog Delay)

Postby Bernardduur » 15 Jul 2008, 16:19

In my unit the holes for the wires are there but no wires are added
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Re: Pearl - F-605 (Analog Delay)

Postby Dirk_Hendrik » 15 Jul 2008, 16:41

most likely testpoints for easy calibration.
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Re: Pearl - F-605 (Analog Delay)

Postby Bernardduur » 15 Jul 2008, 17:16

On your pics I see three empty holes.

In mine there is a transistor there
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Re: Pearl - F-605 (Analog Delay)

Postby lohstah » 16 Jul 2008, 08:03

ok, thanks, so these are test points for calibration.
these pictures were taken before i put everything together again, so now there is a transistor in there alright.

cheers,
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Re: Pearl - F-605 (Analog Delay)

Postby Bernardduur » 28 Jul 2008, 16:28

Got mine to work this day.........nice nice nice delay btw!

the delay time pot was backwards....... for the rest everything worked as planned. I have some hum but I think that is due to my PSU (bad one).

On the schematic is the peak LED backwards; I'll change it!
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Re: Pearl - F-605 (Analog Delay)

Postby analogguru » 28 Jul 2008, 17:02

If you place a (design missing) 10µF electrolytic/tantalum in parallel to the 15V zener diode the hum will even get better at lower voltages because at the emitter the circuit "sees" this as 10µF x (ß of the transistor).

This cap should always be placed to reduce the noise produced by the zener-diode.
You even can improve this circuit by using a resistor (e.g. 470E - 1k) between the zener-diode and the base of the transistor (where the cap should be located).

Beside the effect that you create a LPF with that, you have the benefit of protecting the zener diode in case that the transistor fails.

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Re: Pearl - F-605 (Analog Delay)

Postby analogguru » 28 Jul 2008, 17:16

DiscoFreq wrote:It's still the only one of the F-60x series I don't have:

Vorg F-501 Phase Shifter
Pearl F-601 Phase Shifter
Pearl F-602 Warp Sound
Pearl F-603 Graphic Equalizer
2x Pearl F-604 Flanger Analog Delay Effect

I tried to swap one of the flangers for a delay a few times, but didn't succeed yet ;)

I have a deal for you:
If you take guts from the units you alread have (to trace it of course :wink: ) I will send you my F-605 for a very good price. Make a suggestion - the last I have seen sold for EUR 180,-- and EUR 250,-- on evilbay.

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Re: Pearl - F-605 (Analog Delay)

Postby Dirk_Hendrik » 28 Jul 2008, 17:18

Sold or listed?
The rough average I've seen them go for is around 120.
Sorry. Plain out of planes.

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