I know I'm late to the party but wanted to say thanks for posting your research on this. I downloaded the pdf manual and added this to my list of things to build.
Not without modification, the output op-amp can only handle +/-40V supplies, giving less than 80Vp-p output. You'd either have to make a transistorized output that ran on higher voltage or make a toroidal transformer to step up the voltage. Also, the amp might not be able to drive the transducer correctly if it is very capacitive. This amp plus a soft iron core transformer might work.
The negative terminals of the power supplies are not directly connected to ground. There are separate ground and negative terminals. I connected the two power supplies in series and the connection point of the + and - I took as ground for the device. It's no different than connecting two batteries in series.
Funny, I was reading your article and then looked at the datasheets for the opamps, but what I saw is htat the opa541 has a pretty sharp rolloff, so for ultrasonic it is not really a good choice... do you do anything about 20khz?
Here's a link to a kit for an improved one I made, you can get the whole thing or just a PCB: thetuberoaster.com/products/function-generator-amplifier-full-kit The kit description has a list of parts, manual and schematic. Here's the manual, which explains the circuit: cdn.shopify.com/s/files/1/0498/1833/7429/files/Function_Generator_Amp_Manual.pdf?v=1606795121
In short, it's possible to make something like that but it's a pain. Maybe if you made a push-pull driver stage connected into the feedback loop of the op-amp. The driver transistors (BJT or MOSFET) would have to be rated for at least 400V and would need a large heatsink depending on how much current you need to drive. I have a video on this called "Class C Amplifier" which shows how to make a lo-fi power booster for an existing amp. If you need higher AC voltage than what this circuit can make, a transformer might be a simple and viable solution, as long as the frequency is not too high. Then again, the secondary will be very current limited.
With 24 V supplies, you can get somewhere around 44 Vp-p maximum with this thing. It will work fine at 40 kHz at the default gain setting. I think it starts to slew rate limit around 200 kHz. Unfortunately, this is not available online anymore.
Yeah, these not too much out there for a function generator amp. There was a 2 channel 5 watt Juntek one for about $70 but nothing more powerful. Not sure if CB amps would work or not. I dont know much about electronics so making my own isnt an option. There's one guy who makes Rife machines that builds an amp with built in carrier frequency for $170 but you have to supply your 48 watt and 20 watt power supplies. This is the link: spectrotek.com/pa1.htm Sure seems like there's an untapped market out there, especially for guys looking to build their own rife machines. Thanks for the vid.
I know I'm late to the party but wanted to say thanks for posting your research on this. I downloaded the pdf manual and added this to my list of things to build.
Thanks, I just needed exactly this info about transformer driving :D
Can you push out 200volt at 40khz with this amp?
Need to drive a transducer.
Not without modification, the output op-amp can only handle +/-40V supplies, giving less than 80Vp-p output. You'd either have to make a transistorized output that ran on higher voltage or make a toroidal transformer to step up the voltage. Also, the amp might not be able to drive the transducer correctly if it is very capacitive. This amp plus a soft iron core transformer might work.
How did you connect PSU-s ? They are ground referenced and touching each other.
The negative terminals of the power supplies are not directly connected to ground. There are separate ground and negative terminals. I connected the two power supplies in series and the connection point of the + and - I took as ground for the device. It's no different than connecting two batteries in series.
@@thetuberoaster8321 Thx. Didn't know that meanwell PSU-s come "isolated" out of factory.
Funny, I was reading your article and then looked at the datasheets for the opamps, but what I saw is htat the opa541 has a pretty sharp rolloff, so for ultrasonic it is not really a good choice...
do you do anything about 20khz?
Nice one. Your work is neat. Your presentation clear!!! Can you provide one your circuit diagram and BOM. I would like to build this. Kind Regards
Here's a link to a kit for an improved one I made, you can get the whole thing or just a PCB: thetuberoaster.com/products/function-generator-amplifier-full-kit
The kit description has a list of parts, manual and schematic. Here's the manual, which explains the circuit:
cdn.shopify.com/s/files/1/0498/1833/7429/files/Function_Generator_Amp_Manual.pdf?v=1606795121
@@thetuberoaster8321 Checked this out, but the price. Thought I could have some circuit drawing to build. Thanks anyway.
cannot enter your link to see the kit. It displays "forbiden" no matter what browser I use
I'm sorry, the kit no longer exists. I thought I removed all the links.
Do you have a BOM you can give? Because im wondering, do i need 3W resistors for every resistor, or only for the 0.1 ohm
The 3W resistor is only the 0.1 ohm. All the others are 1/4 watt rated.
NIce sharing, is it posible to make amplifier to boost voltage arround 380V (12khz)? I want to use that as ohmic heating power supply
In short, it's possible to make something like that but it's a pain. Maybe if you made a push-pull driver stage connected into the feedback loop of the op-amp. The driver transistors (BJT or MOSFET) would have to be rated for at least 400V and would need a large heatsink depending on how much current you need to drive. I have a video on this called "Class C Amplifier" which shows how to make a lo-fi power booster for an existing amp. If you need higher AC voltage than what this circuit can make, a transformer might be a simple and viable solution, as long as the frequency is not too high. Then again, the secondary will be very current limited.
I need to amplify a sine wave of 40 kHz coming from signal generator. will this work? my target is 40 Vpp. also is it available online?
With 24 V supplies, you can get somewhere around 44 Vp-p maximum with this thing. It will work fine at 40 kHz at the default gain setting. I think it starts to slew rate limit around 200 kHz. Unfortunately, this is not available online anymore.
Does this work with rf signals too?
It will do 10Vp-p at 500kHz but it's really not effective at higher RF.
Will it work for positive offset square waves?
Keeping the signal square at moderate loads?
Yes
for voltage 10x only or also....can push out max current of 1 A or more...
It's current limited to 6.7A with the 0.1 ohm resistor regardless of what gain you have it set to.
gooooooood .........
Can you apply the output on a resistor as a load? To test resistivity for example
Yes, it will work perfect for resistive loads. It struggles with capacitive loads however.
@@thetuberoaster8321 thanks man
Yeah, these not too much out there for a function generator amp. There was a 2 channel 5 watt Juntek one for about $70 but nothing more powerful. Not sure if CB amps would work or not. I dont know much about electronics so making my own isnt an option. There's one guy who makes Rife machines that builds an amp with built in carrier frequency for $170 but you have to supply your 48 watt and 20 watt power supplies. This is the link: spectrotek.com/pa1.htm
Sure seems like there's an untapped market out there, especially for guys looking to build their own rife machines. Thanks for the vid.
maybe you could offer kits online
I might just do that
DID YOU MAKE PRINTED CIRCUIT BOARD OR, WAS IT ALREADY MADE WITH THE CIRCUIT TRACES ON?
I designed and assembled it. The software I used was Eagle and the PCB making service was PCBWay.