Pocket Oscillator

[mediatechnology]

Ian I don't think it would need any changes for 9V.
The timing will be shorter but the 220uF could be made larger. Not sure about the 10M.
I have it on the bench and can easily check it.

I'm close to posting the full schematic.
Yesterday I found an error in the original schematic regarding the pad values.
The balanced output level of the oscillator is +18 dBu and the pad is -18 dB, not -12 dB as shown...

[mediatechnology]

I started a new thread with schematics on a modern update to the pocket oscillator.

viewtopic.php?t=1511

[mediatechnology]

The Xvive AT-1 Audio Tester

https://www.amazon.com/Xvive-AT-1-Porta ... 0DQY46J9B/

Simplify Audio Troubleshooting: The AT-1 audio tester integrates a signal generator, XLR cable tester, phantom power checker, input level meter, and headphone/speaker monitoring into a single compact unit. Designed for live sound engineers and audio professionals, it’s perfect for testing and troubleshooting PA systems, mixers, DI boxes, and effects units.

Signal Generator: The AT-1 tester produces a 1 kHz sine wave or pink noise, with outputs available via XLR, 6.35 mm (1/4"), or 3.5 mm(1/8") connectors. Output levels are adjustable (-10 dB, -20 dB, -40 dB),making it ideal for frequency response analysis and signal path diagnostics.

XLR Cable Tester:Easily test XLR cables with automatic pin-by-pin diagnostics. Simply connect the cable and press the SEL button for 2 seconds to start testing. LED indicators will sequentially check each pin and highlight faults (e.g., open or short circuits on Pin 2 or Pin 3), enabling quick identification and resolution of cable issues.

Phantom Power Checker: Verify phantom power voltage within a range of 24V to 52V using clear LED indicators: Solid LED: Voltage between 44V-52V (line OK). Flashing LED: Voltage between 24V-44V (line OK). This ensures your phantom-powered microphones and devices receive the correct voltage, preventing performance issues or equipment damage.

USB-C Rechargeable: Compact and portable, the AT-1 features a USB-C charging port and a built-in rechargeable battery that fully charges in 1.5 hours. A low battery warning ensures uninterrupted operation, and the device supports use while charging.

[AnalogJoe]

The Xvive AT-1 Audio Tester

https://www.amazon.com/Xvive-AT-1-Porta ... 0DQY46J9B/

Simplify Audio Troubleshooting: The AT-1 audio tester integrates a signal generator, XLR cable tester, phantom power checker, input level meter, and headphone/speaker monitoring into a single compact unit. Designed for live sound engineers and audio professionals, it’s perfect for testing and troubleshooting PA systems, mixers, DI boxes, and effects units.

Signal Generator: The AT-1 tester produces a 1 kHz sine wave or pink noise, with outputs available via XLR, 6.35 mm (1/4"), or 3.5 mm(1/8") connectors. Output levels are adjustable (-10 dB, -20 dB, -40 dB),making it ideal for frequency response analysis and signal path diagnostics.

XLR Cable Tester:Easily test XLR cables with automatic pin-by-pin diagnostics. Simply connect the cable and press the SEL button for 2 seconds to start testing. LED indicators will sequentially check each pin and highlight faults (e.g., open or short circuits on Pin 2 or Pin 3), enabling quick identification and resolution of cable issues.

Phantom Power Checker: Verify phantom power voltage within a range of 24V to 52V using clear LED indicators: Solid LED: Voltage between 44V-52V (line OK). Flashing LED: Voltage between 24V-44V (line OK). This ensures your phantom-powered microphones and devices receive the correct voltage, preventing performance issues or equipment damage.

USB-C Rechargeable: Compact and portable, the AT-1 features a USB-C charging port and a built-in rechargeable battery that fully charges in 1.5 hours. A low battery warning ensures uninterrupted operation, and the device supports use while charging.

Looks nice, useful and affordable. You could stick your pocket oscillator into an enclosure like that and sell it. Although it could probably end up costing more than the AT-1. Yours is more of a niche product, the AT-1 is a tool for a live sound engineer who wants to do some simple tests but who cares little about THD.

[mediatechnology]

I think the niche for mine is more of a low THD floating bench instrument.
I have a Cheng Instruments battery powered "pocket oscillator" but it's not balanced.
It mostly exists because I wanted to see if I could do it with low power and the OPTOFET.

The AT-1 would be what I would want to use in the field.
It's monitoring feature is nice.

[Tubetec]

Behringer does the CT-200 cable tester/signal generator for 39 Euros ,
Heres a list of other similar units on the market
https://mainstreetmobile.org/audio-cable-tester/

[Tubetec]

https://homestudioguys.com/cables-and-c ... le-tester/
a few other options here ,
The Sound tools tester looks neat , runs from an A23 battery or phantom ,

How would the pocket oscillator look in SMD ?
Only a level meter would need to be added to make a self contained tester , the attenuator pad could be added externally as required ,

[mediatechnology]

Need an RF pocket oscillator?

https://elecraft.com/products/xg3