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Messages - koos

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TS500 Tape Simulator / Re: Distorted output - also in bypass
« on: July 23, 2023, 01:38:15 PM »
Bit late on my side but I can confirm that this problem was indeed caused by myself: Reversing the placement of Q1 power transisor.
Reversing again it solved it! Sorry for replying to this so late..

TS500 Tape Simulator / Re: Distorted output - also in bypass
« on: May 03, 2022, 02:15:57 PM »
Hi JPK, thanks for the reply and clearing things up.

Here's my test report:

(DC seems zero on all points.)
(VAC readings: 0,25 VAC sine wave)


TP1 1.4
TP2 7.1
TP3 3.2
TP4 3.1
TP5 3.1
TP6 2.7
TP7 0


TP1 1.3 
TP2 6.9
TP3 3.3
TP4 3.2
TP5 3.1
TP6 2.8
TP7 0

I reckon this doesn't seem too good..
I had some problems soldering U13 in the first place but after a reflow of this and other joints I still got these readings

Hope there is something to say about this!

Regards, Koos

TS500 Tape Simulator / Distorted output - also in bypass
« on: April 28, 2022, 05:13:44 PM »

I made 2 units this week but apparently not very succesful. 
They both have a distorted output (also in bypass), from which one of the units the low freqs appears to be gone. At lower levels the outputs appears 'gated'. VU meter is working. Drive seems to be working. Checked IC's/networks/ resoldered suspicious joints, but no success.

Voltages are (both units):
V+ 15.6
V- 15.9

Not sure how the measure the units test points though!

Hope you can help me out.


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