Help with Rocktron Hush

msymms · 8th November 2010, 09:28 PM

Hi All,
I picked up a Rocktron Hush that wouldn't power on (broken wire on battery clip). Replaced the 9v clip, but still doesn't work. There is 9v everywhere on the board, e.g. each and every pin on the two TL074s. Switch position is of no consequence.

Granted I am fairly new to this. I would like to get this working and learn a little as well. Any help or ideas. No scope .. only a DMM.

-mark

indianajo · 9th November 2010, 12:58 AM

Most DMM's are insensitive to AC waveforms except for 50/60 Hz power waves. I proved my $29 craftsman was unable to see a 8V pp wave coming out of my Hammond organ at 200 hz, even on the 200V scale. Used scopes can go as low as $40, an obsolete 20 mhz scope is adequate for audio work. But lacking that, sometimes you can put a .1 microfarad 50 V capacitor on a little speakers,(transistor, use 600V for tubes) and a couple of clipleads, and go looking around your circuit to see where the audio gets lost using your ears.

Enzo · 9th November 2010, 01:08 AM

He has power problems, not loss of signal.

If you have 9v on every pin of the ICs, then the ground circuit sounds open.

This is a little pedal right? You do know that FX pedals generally have to have a plug in the input jack to complete the power circuit? The ring contact is grounded by the plug to complete the powr circuit. ANy chance that is your oversight?

msymms · 9th November 2010, 03:01 AM

I didn't know about the input Jack completing the circuit. I am new to this. I will try this and get back. Thanks.

Mark

8th November 2010, 09:28 PM	#1
msymms diyAudio Member Join Date: Oct 2010 Location: Texas	Help with Rocktron Hush Hi All, I picked up a Rocktron Hush that wouldn't power on (broken wire on battery clip). Replaced the 9v clip, but still doesn't work. There is 9v everywhere on the board, e.g. each and every pin on the two TL074s. Switch position is of no consequence. Granted I am fairly new to this. I would like to get this working and learn a little as well. Any help or ideas. No scope .. only a DMM. -mark

9th November 2010, 12:58 AM	#2
indianajo diyAudio Member Join Date: Jan 2010 Location: Jeffersonville, Indiana USA	AC debug Most DMM's are insensitive to AC waveforms except for 50/60 Hz power waves. I proved my $29 craftsman was unable to see a 8V pp wave coming out of my Hammond organ at 200 hz, even on the 200V scale. Used scopes can go as low as $40, an obsolete 20 mhz scope is adequate for audio work. But lacking that, sometimes you can put a .1 microfarad 50 V capacitor on a little speakers,(transistor, use 600V for tubes) and a couple of clipleads, and go looking around your circuit to see where the audio gets lost using your ears. __________________ Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,SP2-XT's, T-300 HF Projs, Steinway console, Herald RA88a mixer, Wurlitzer 4500

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9th November 2010, 01:08 AM	#3
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	He has power problems, not loss of signal. If you have 9v on every pin of the ICs, then the ground circuit sounds open. This is a little pedal right? You do know that FX pedals generally have to have a plug in the input jack to complete the power circuit? The ring contact is grounded by the plug to complete the powr circuit. ANy chance that is your oversight?

9th November 2010, 03:01 AM	#4
msymms diyAudio Member Join Date: Oct 2010 Location: Texas	I didn't know about the input Jack completing the circuit. I am new to this. I will try this and get back. Thanks. Mark

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