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August 1, 2025

24VAC to adjustable VDC 5 Amp AC/DC Converters with user set output between 1V and 18V

24VAC to 5V, 6VDC, etc.

Tiny switchmode 24VAC / 5A power supply offers much higher efficiency and lower ripple than the linear versions. The biggest application of these is to power 3.3V, 5V, 8.4V, 9V, 10V, 12V, 14V, 15V, 16V devices in 24VAC installations.

  Quantity 1-9 10-49 50-99 100-199 200+
PST-AC24DC-ADJ
User adjustable output		 add_to_cart.gif $29.75 $27.90 $24.60 $23.50 $20.15
PST-AC24DC5
5V output set at factory		 add_to_cart.gif $29.75 $27.90 $24.60 $23.50 $20.15
Optional DIN mounting hardware
reverse view of DIN rail mounting

add_to_cart.gif 		 
Quantity Price
1-49 $3.50
50-99 $2.50
Includes screws and
hardware for both 35mm and
15mm DIN rails (does not include the rail)		  
PST-AC24DCADJ    
Input voltage AC 24VAC nominal 10VAC to 28VAC
Input voltage range Input voltage must be higher than the output voltage. Input voltage range 8VAC-30VAC  
Input voltage DC Also operates on DC voltage if desired 10VDC to 40VDC
Output voltage Adjustable between 1VDC and 18VDC  
Output voltage adjustment Voltage adjustment is through a multi-turn trim pot  
Output Current Depends on the output voltage, see table below, up to 36W  
Input Frequency 50Hz, 60Hz 48 Hz to 65 Hz
Voltage Accuracy ±3% at 0.2A load
Switchmode frequency 150kHZ  
Load regulation <1.2% over the output current range from 0.2 to 1.5A  
Protections Short circuit protect, current limit protection  
Operating Temperature -40°C to +80°C  
Storage Temperature -50°C to +108°C  
Thermal Shutdown 135°C internal temperature  
Connection Wire leads, input and output  
DC input When using a direct current input, connect the plus and minus to the input terminals, it doesn't matter which is the plus or minus, since we put a full bridge rectifier on the input, which will sort it correctly.  
Isolation The output is not isolated from the input, the plus and minus output leads must not be electrically connected to either of the AC input wires.  
Wire gauge 18 AWG  
Weight 2.8 oz., 80 grams  
Dimensions 38 x 85 x 23 mm  
Warranty 1 year  

The following table gives a snapshot of a few voltages and output currents that gives an idea of the capabilities. The converter is designed to use 24VAC input, but can be operated at lower input voltages depending on the output voltage and current:

Output Voltage Current RMS Ripple* Minimum input voltage Tested input voltage
1 Volt 4A 7mV 10VAC 10VAC-40VAC
2V 7A 9mV 10VAC 10VAC-40VAC
3.3V 7A 9mV 10.5VAC 10VAC-40VAC
5V 0.8A   8VAC 8VAC-40VAC
5V 1.1A   9VAC 9VAC-40VAC
5V 1.6A   10VAC 10VAC-40VAC
5V 2.5A   11.5VAC 11.5VAC-40VAC
5V 5A   15.5VAC 15.5VAC-40VAC
6V 2A 50mV 10.5VAC 10.5VAC-40VAC
6V 5A   17.5 VAC 17.5VAC-40VAC
8V 2A   12VAC 12VAC-40VAC
8V 4A   16VAC 16VAC-40VAC
10V 1A   12VAC 12VAC-40VAC
10V 2A   15VAC 15VAC-40VAC
10V 3A   17VAC 17VAC-40VAC
10V 5A   20VAC 20VAC-40VAC
12V 1A   14VAC 14VAC-40VAC
12V 2A   16VAC 16VAC-40VAC
12V 3A 47mV 19VAC 24VAC-40VAC
14V 3.5A 50mV 22VAC 24VAC-40VAC
15V 3A   24VAC 24VAC-40VAC
16V 3A   24VAC 24VAC-40VAC
18V 3A   24VAC 24VAC-40VAC

* 50/60Hz ripple will go down as the current goes down, as it is due to the size of the input capacitors.


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