hammerhead 1 opt 1

[uvgunkhuu]

hi dear all
preamp output noise signal also speaker not volume
help please?

[Qiaozhi]

hi dear all
preamp output noise signal also speaker not volume
help please?

If you want help with your problem, you will need to supply a lot more information.
Try some simple tests first:
Are all the power supplies working?
Does the oscillator oscillate?
Do you have all the options configured correctly?
If there's a signal at the coil, what does it look like?
Please post some oscilloscope shots.

The Hammerhead is a fairly complex design for a beginner. If you build the detector carefully step by step, and test each section as you go (as recommended in the HH article) you can get the unit working without a scope (if you're lucky!). If things go wrong (or you simply soldered everything on the PCB at once) then it's almost certain you'll need a scope to track down the problem.

[uvgunkhuu]

solved problem noise signal

thanks for Qiaozhi admin

hi dear
hammerhead pi 1 rev c2 opt 1

VCO audio very low not setting r31,r35,r41 they are not response
r35 and r41 nulling value as speaker not loudless
help please?
must be integration time and rc coupling discharge time same (Reference Patent number 5,414,411 puls induction metal detector) but hammerhead project integration time c17xr26=0.1u x 100k=100msec and rc coupling circuit discharge time =c19x(r34+r34a)
max time =0.47u x (1M+100k)=0.517s
min time =0.47u x 100k=47msec
discharge time between (47msec-0.517s)
why should be c19 value =c17 value ?
will be hammerhead working agree (Patent number 5,414,411 puls induction metal detector)?
wiil be hammerhead pi 2 project is used goldmaster dd coil?
help please?

[Qiaozhi]

thanks for Qiaozhi admin

hi dear
hammerhead pi 1 rev c2 opt 1

VCO audio very low not setting r31,r35,r41 they are not response
r35 and r41 nulling value as speaker not loudless
help please?
must be integration time and rc coupling discharge time same (Reference Patent number 5,414,411 puls induction metal detector) but hammerhead project integration time c17xr26=0.1u x 100k=100msec and rc coupling circuit discharge time =c19x(r34+r34a)
max time =0.47u x (1M+100k)=0.517s
min time =0.47u x 100k=47msec
discharge time between (47msec-0.517s)
why should be c19 value =c17 value ?
will be hammerhead working agree (Patent number 5,414,411 puls induction metal detector)?
wiil be hammerhead pi 2 project is used goldmaster dd coil?
help please?

Set R35 and R45 in the middle.
R41 should be an audio taper, not a linear or log type. Turn volume to maximum.
If still not working, then the problem is somewhere else.
Why are you referring to patent 5,414,411? This has nothing to do with the Hammerhead design.
Firstly, check all the power supplies (+5, -5 and -5D). Are they ok?

[uvgunkhuu]

so much thanks

[UFO]

Why are you referring to patent 5,414,411? This has nothing to do with the Hammerhead design.

I see any awful lot of these types of posts on other forums. They are usually trying to take your work to produce products to sell on eBay, very poorly I might add, due to using inferior or counterfeit components.

I have seen them take designs for high voltage tube amplifiers (audio) and produce/sell kits to the public without even checking functionality, lacking any understanding of the circuit or ability to design. Dangerous indeed. At least these detectors don't run at 400v.