TG1 - advice from any one who has built it...

[crisotop]

what I got out of the datasheets:

LL1540 could be used as an Output (use only one primary / secondary winding)
LL1527 is not suitable

hope this is correct,
christoph

 

[warpie]

what I got out of the datasheets:

LL1540 could be used as an Output (use only one primary / secondary winding)
LL1527 is not suitable

hope this is correct,
christoph

I'm afraid I got a bit confused.

According to the datasheets LL1540 is a Line Input Transformer and LL1517 (not LL1527) an Output Transformer  ???

 

[crisotop]

As far as my knowledge goes there's no such thing as a dedicated in- or output transformer. What counts ins the turns ratio and the impedance of the windings. Depending on your version of the trafo / bypass board you roughly need a 10k/10k input- and a 600:600 output tranny. The 1540 if you only use one primary and one secondary winding would give you 600:800 which should be fine as an output trafo for the tg1.

hth, christoph

 

[warpie]

As far as my knowledge goes there's no such thing as a dedicated in- or output transformer. What counts ins the turns ratio and the impedance of the windings. Depending on your version of the trafo / bypass board you roughly need a 10k/10k input- and a 600:600 output tranny. The 1540 if you only use one primary and one secondary winding would give you 600:800 which should be fine as an output trafo for the tg1.

hth, christoph

ok I see. Now makes more sense..
I'll try this.

I assume the 1540 can't be used in 1:2 ratio as 150:600, is this correct?

 

[Rob Flinn]

If you look at the documentation that Fester provides it tells you how to use transformers with other ratios.  You just change some of the resistors on the switch board, to accomodate more or less gain.

 

[echotodd]

I'm going to post this here too because it seems folks are looking for a 1:2 output transformer.  I've been in contact with Colin over at Audio Maintenance.  He's going to have available a bracket mounted L01173 really soon from Carnhill.  It's going to have a smaller bobbin than the VTB9056 which is more in line with the original.  Good news!

 

[maxwall]

.

 

[noulou]

just found 6x NPN Mot' 2N4910 for $.45 each, but need the PNP compliment

Care to share the source of the 2n4910s? I'm looking for one for my build.

Thanks,
Nikos

 

[warpie]

does anyone have issues with R77 (56 Ohm) resistor?
I'm using a 1Watt one and still runs hot.

Also, I don't use C3, C4, C7, C121 because I don't have any spare ones at the moment.
Could this cause R77 getting hot?
FWIW, a JLM Audio PSU (AC/DC) supplying the circuit with +/-28 Volts.

 

[maxwall]

.

 

[crisotop]

My unit is finally running as well, very happy with the sound, extremely versatile compressor.

Two questions though:

I have a slight volume drop when switching the transformers (1:1 variant, 10k:10k edcor input, 600:600 sowter output) in the circuit, but I haven't installed an Rz/Cz at the output trafo yet. As far as I know this is just to correct frequency response and should not affect overall level?

And just to confirm I got the attack and release controls right, I'd like to know how the auto settings behave on your already finished units.

Many Thanks,
Christoph 

 

[T-rex]

Just jumping in to say I am starting to source parts for this build starting tomorrow.  Samples so far sound great!

 

[oceres]

I'm trying to figure out which relays are suitable for the bypass board...

Does it need to be a specific coil resistance`?

 

[Rob Flinn]

I'm trying to figure out which relays are suitable for the bypass board...

Does it need to be a specific coil resistance`?

Nope just 24v in the required footprint.

 

[Michael Tibes]

I'm trying to figure out which relays are suitable for the bypass board...

Does it need to be a specific coil resistance`?

http://cgi.ebay.de/Relais-Takamisawa-RY24W-K-Relay-2x-UM-z-B-Audio-Signal-/310199115141?cmd=ViewItem&pt=Audio_Zubeh%C3%B6r&hash=item48394edd85 is what I just ordered. Haven't put them in yet, but specs seem very good and so's the price. Shipping to Finland (that's where you are?) is 7,55€ unregistered ...

Michael

 

[oceres]

I'm trying to figure out which relays are suitable for the bypass board...

Does it need to be a specific coil resistance`?

http://cgi.ebay.de/Relais-Takamisawa-RY24W-K-Relay-2x-UM-z-B-Audio-Signal-/310199115141?cmd=ViewItem&pt=Audio_Zubeh%C3%B6r&hash=item48394edd85 is what I just ordered. Haven't put them in yet, but specs seem very good and so's the price. Shipping to Finland (that's where you are?) is 7,55€ unregistered ...

Michael

Thanks! 
I came across RY24W-K too and found similar type from Mouser: Omron G5V-2-H1-DC24
either should work

 

[Michael Tibes]

The minimum switching current is factor 10 lower (better) with the Takamisawa types, but I believe the Omrons should do fine as well.

Michael

 

[warpie]

Has anyone used these: http://uk.farnell.com/nec/ea2-24nu/relay-dpco-24vdc/dp/1094032?Ntt=1094032

 

[briomusic]

that footprint looks wrong to me, I would expect to find 4 pairs of pins, the one for the coil slightly further away from the other pairs. like in the earlier ebay link.

 

[warpie]

that footprint looks wrong to me, I would expect to find 4 pairs of pins, the one for the coil slightly further away from the other pairs. like in the earlier ebay link.

thanks  briomusic. didn't notice...