CircuitSourcery: Schematics, Manuals, & Modifications

Tutorials, tools, techniques, methodologies......
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WhiteWarlock
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Re: CircuitSourcery: Schematics, Manuals, & Modifications

Post by WhiteWarlock » Thu Feb 13, 2020 11:26 pm

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BPM DETECTOR

Heart rate is the number of heartbeats per unit of time and is usually expressed in beats per minute (bpm). In adults, a normal heart beats about 60 to 100 times a minute during resting condition.
This project demonstrates a technique to measure the heart rate by sensing the change in blood volume in a finger artery while the heart is pumping the blood. It consists of an infrared LED that transmits an IR signal through the fingertip of the subject, a part of which is reflected by the blood cells. The reflected signal is detected by a photo diode sensor. The changing blood volume with heartbeat results in a train of pulses at the output of the photo diode, the magnitude of which is too small to be detected directly by a microcontroller. The signal conditioning circuit consists of two identical active low pass filters with a cut-off frequency of about 2.5 Hz. This means the maximum measurable heart rate is about 150 bpm. An LED connected at the output blinks every time a heart beat is detected.
The firmware does all the control and computation operation. In order to save the power, the sensor module is not activated continuously. Instead, it is turned on for 15 sec only once the start button is pressed.
Turn the power on, and you will see all zeros on display for few seconds. Wait till the display goes off. Now place your forefinger tip on the sensor assembly, and press the start button. Just relaxed and don’t move your finger. You will see the LED blinking with heart beats, and after 15 sec, the result will be displayed.

https://rumunsko.mypage.cz/menu/lekarsk ... niho-rytmu

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Re: CircuitSourcery: Schematics, Manuals, & Modifications

Post by WhiteWarlock » Fri Feb 14, 2020 12:45 am

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The original Gristleizer (aka: The Gristleiser or The Gristliser) was an analogue special effects unit used by industrial experimental band Throbbing Gristle during the 1970s & early 1980s.

The original Gristleizer unit (including the name) was designed and made by Chris Carter and was based on a DIY construction project by Roy Gwinn that was published as the 'GEP' (Guitar Effects Pedal) in Practical Electronics magazine (July 1975 issue). Roy Gwinn’s project was also was sold in a basic kit form (just the PCB & components) by Phonosonics in the UK in 1977.
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attachment=0]Gristleizer_sch.jpg[/attachment]
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Re: CircuitSourcery: Schematics, Manuals, & Modifications

Post by WhiteWarlock » Fri Feb 14, 2020 5:23 am

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Re: CircuitSourcery: Schematics, Manuals, & Modifications

Post by WhiteWarlock » Fri Feb 14, 2020 7:08 am

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Re: CircuitSourcery: Schematics, Manuals, & Modifications

Post by WhiteWarlock » Tue Feb 18, 2020 11:46 am

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Univox EC-80a Echo Chamber

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Re: CircuitSourcery: Schematics, Manuals, & Modifications

Post by timdrage » Wed Feb 19, 2020 12:53 pm

WhiteWarlock wrote:
Fri Feb 14, 2020 5:23 am
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Built something very similar the other day, breadboard version was a great little noise synth (which didn't exactly produce true 'white noise' on any setting!?) but of course a 2nd soldered version didn't seem to work properly at all... back to the drawing board :D

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Re: CircuitSourcery: Schematics, Manuals, & Modifications

Post by Indeterminacy » Wed Feb 19, 2020 5:48 pm

Is this schematic verified?
WhiteWarlock wrote:
Fri Feb 14, 2020 12:45 am
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"Logical validity is not a guarantee of truth" - David Foster Wallace

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Re: CircuitSourcery: Schematics, Manuals, & Modifications

Post by WhiteWarlock » Wed Feb 19, 2020 6:12 pm

Indeterminacy wrote:
Wed Feb 19, 2020 5:48 pm
Is this schematic verified?
WhiteWarlock wrote:
Fri Feb 14, 2020 12:45 am
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have the original Gwinn GEP Pop Electronics article schematic around here... you can check the differences if any...
let me look for it in my archives... searching...........................................................................................................................
that looks one looks correct... can probably breadboard it when have extra time...
yet not today... busy... on other projects...
should anyways for making +/-9v rack module
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and/or you can just contact CC for asking him...
http://gristleizer.com/
https://twitter.com/chris_carter_

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Re: CircuitSourcery: Schematics, Manuals, & Modifications

Post by WhiteWarlock » Wed Feb 19, 2020 6:46 pm

Practical Electronics July 1975
https://www.americanradiohistory.com/UK ... 975-07.pdf
search for the Gwinn GEP article...
busy

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Re: CircuitSourcery: Schematics, Manuals, & Modifications

Post by WhiteWarlock » Wed Feb 19, 2020 6:52 pm

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Here is the entire Practical Electronics Magazine from the UK starting in 1964...
archived in PDF
https://www.americanradiohistory.com/Pr ... ronics.htm
DIY

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